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Master Series Inertia Flexible Cum-Thru Penis Plug - Penis Plugs
Master Series Inertia Flexible Cum-Thru Penis Plug - Penis Plugs
Master Series Inertia Flexible Cum-Thru Penis Plug - Penis Plugs

Master Series Inertia Flexible Cum-Thru Penis Plug

$199.99
$199.99

Master Series Inertia Flexible Cum Thru Penis Plug delivers deep urethral sensation through medical-grade silicone construction. This hollow sex toy allows cum flow while creating powerful pressure against your cocks most sensitive nerves for satisfying edging control.

Key Features:

Medical grade silicone shaft with stainless steel components creates flexible penetration for penis plug stimulation during masturbation and arousal enhancement through hollow design allowing ejaculation.

Insertable length of 3.75 inches with 0.3 inch diameter provides comfortable urethral penetration while the hollow construction enables cum through functionality during orgasm and climax.

Two interchangeable head rings at 1.2 inches and 1 inch diameter allow customized cock ring fit around the penis head for secure placement during penetration play.

Flexible silicone construction adapts to penis anatomy while maintaining shape during insertion and removal for comfortable urethral stimulation and enhanced sexual sensation throughout masturbation sessions.

Hollow design enables natural ejaculation flow during orgasm while the weighted stainless steel components provide internal pressure sensations that intensify arousal and climax during penis stimulation.

Vendor: XR Brands
SKU: NEW-2003
Availability: Out Of Stock
Product type: Penis Plugs
Please hurry! Only 0 left in stock

Master Series Inertia Flexible Cum-Thru Penis Plug delivers direct urethral stimulation through a hollow, flexible medical-grade silicone shaft that adapts to your cock's shape while allowing normal ejaculation during edging sessions.

Why choose the Master Series Inertia Flexible Cum-Thru
  • Hollow design: Allows normal ejaculation while maintaining urethral pressure
  • Flexible silicone: Conforms to your shape without pinching or binding
  • Medical-grade materials: Safe for sensitive users and repeated use
  • Dual cock rings: Two sizes for customizable secure positioning
  • Extended arousal: Heightened sensitivity lasting 30–45 minutes after removal
  • Hands-free edging: Constant gentle pressure maintains arousal without manual effort
  • Stainless steel components: Durable construction and added sensation awareness
📦 Discreet plain-wrapped delivery  •  💳 Private billing  •  ↩️ Easy size-swap returns

What it does

Sliding into your urethra, this plug creates direct contact with nerve endings that external stroking alone cannot reach. Your cock's natural shape guides the flexible silicone shaft as it settles, and the material warms to body temperature within minutes. Unlike solid plugs that block flow completely, the hollow design maintains normal function while applying gentle, constant pressure against the urethral walls. Two interchangeable cock rings—one 1.2 inches and one 1 inch in diameter—secure the plug against your glans without cutting circulation.

During an edging session, arousal builds gradually as the silicone conforms to your cock's contours. Many users report that orgasm quality improves significantly when practising with this plug, because the sustained gentle pressure keeps arousal elevated without forcing immediate release. Tapered Penis Plugs work differently, using a gradual taper for insertion, whereas this design relies on its flexible construction and hollow core.

Specifications

  • Total length: 4.2 inches
  • Insertable length: 3.75 inches
  • Shaft diameter: 0.3 inch
  • Material: Medical-grade silicone with stainless steel components
  • Cock rings: Two interchangeable sizes (1.2 inch and 1 inch diameter)
  • Ring arm: 0.9 inch for optimal positioning stability
  • Design: Hollow shaft allows normal ejaculation

Size and first use

Start slowly when you're new to urethral insertion. Apply water-based lubricant generously and begin with just the tip, letting your cock adjust to the sensation before working deeper. Your urethra will gradually relax and accept the flexible silicone shaft as you proceed. Cockringshop specialise in products for men and couples exploring urethral play, and the flexible construction here makes it easier for beginners to progress at their own pace. Once fully inserted, position one of the two cock rings against your glans—whichever size feels most secure—and you're ready to start building arousal.

How to use it

Clean the plug thoroughly with warm water and soap before each session. Apply water-based lube along the entire insertable shaft and to your urethra opening. Insert slowly, allowing your cock to adjust, then position the selected cock ring against your glans for hands-free security. Begin stroking normally—the plug will maintain constant urethral contact throughout, creating unique dual sensations as pressure remains against nerve endings.

During edging, the hollow design allows you to ejaculate without removing the plug, so fluid passes through while pressure continues against sensitive tissue. If the ring slips during a longer session, pause and reposition it. After climax, gently withdraw the plug, then rinse it immediately with warm water. Allow it to air-dry completely before storage.

Feature breakdown

Feature Specification Benefit Experience
Hollow silicone shaft 3.75 inches insertable length Maintains ejaculation flow while creating urethral pressure Natural release without removing the plug during climax
Flexible construction Medical-grade silicone material Adapts to cock shape for comfortable extended wear Moves naturally without pinching or binding
Dual cock rings 1.2 inch and 1 inch diameter options Provides secure positioning for hands-free arousal Customizable fit prevents slipping during sessions
Steel components Stainless steel ring construction Adds weight for enhanced sensation awareness Durable design withstands repeated use and cleaning

Who it suits

This plug is ideal for cock owners who have some experience with urethral insertion and want to progress beyond basic external touch. If you enjoy edging and want to maintain arousal without hands-on effort, the hollow design and flexible silicone make sustained sessions more comfortable. Medical-grade materials suit sensitive users, and the flexible construction allows beginners to start gradually and work deeper at their own pace.

Skip this if you're completely new to any internal penile play—start with education and shorter sessions first. It's also not the right choice if you want a completely rigid plug or if urethral insertion doesn't appeal to you at all. Those seeking solid, non-hollow plugs or a different sensation profile will find other options better suited to their needs.

Tested and quality-checked

Every new line we stock is inspected by hand before it goes live — we check the build, the finish, and the materials, and we confirm it is safe and fit for how it will be used. Nothing is used for its intended purpose; it is examined, checked, and re-boxed. What that means for you is simple: you receive a piece we have already vetted, not a guess off a supplier's pallet. See how we test every product →

How it compares

Flexible penis plugs like this one adapt to your cock's natural shape and allow movement during wear, whereas rigid plugs remain fixed and unyielding. Flexible Penis Plugs generally suit longer sessions because they move with your body and reduce pressure points. The hollow core here is a key difference—it lets you ejaculate without removing the plug, whereas many solid plugs block flow entirely. Choose flexible if you want comfort during extended edging; choose solid if you prefer a firmer, more stationary sensation.

Please read — safety first. Put the ring on before you are fully erect and use plenty of water-based lubricant so it slides on without pinching. Keep wear time short — no more than 20 minutes while you are getting used to it, and never fall asleep wearing one. Take it off straight away if you feel numbness, coldness, a change in colour, or any pain, as these mean blood flow has been cut off too far. Never share between partners without cleaning the item first or using a fresh condom. This information is general in nature only and is not medical or professional advice, and does not take your personal circumstances into account. Stop use and speak with a qualified medical professional if you have a relevant health condition, take medication for erectile function or blood pressure, or notice pain, numbness, or discolouration that does not settle.

What you can use it with

Pair this plug with prostate stimulation for layered sensation during edging. Anal Sex Toys work well alongside urethral play because they target a nearby nerve zone and can intensify arousal when used together. Many users find that combining internal penile and anal stimulation creates a richer, more complex sensation profile and can lead to stronger orgasms once you're ready for release.

More from XR Brands

XR Brands specialises in premium BDSM and specialty sex toys built from medical-grade materials. Xr Brands offers a full range of advanced adult toys designed for users seeking quality construction and body-safe materials. Browse their collection to explore other urethral, cock ring, and prostate options.

Read more before you buy

If you're new to penile play or want to understand the anatomy and sensation involved, Penis Envy In A Nutshell covers the fundamentals clearly. That resource will help you feel more confident before your first session.

Why buy the Master Series Inertia Flexible Cum-Thru Penis Plug

Ready to buy with your size sorted? Order the Master Series Inertia Flexible Cum-Thru Penis Plug from The Cock Ring Store with confidence—this is a genuine product that has been function-tested and quality-checked. Cockringshop ships in discreet, plain packaging to protect your privacy. Real fit advice, body-safe materials, and plain-packaged shipping. The Cock Ring Store ships discreetly Australia-wide.

Shipping Information & Policy


Cockringshop.com.au ships with Australia Post. We ship from Sydney.

All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 1-6 business days after shipping, but may subject to any postage carrier related delays beyond our control.

Free standard shipping on orders shipped within Australia above $200. For orders below $200 standard shipping within Australia is $12.95 and will be added at checkout.

Orders addressed to P.O box, G.P.O box or Parcel Collect will be handled by Australia Post. Extra time should be allocated for these orders.

Shipping Transit Times (Including Free Shipping)

Shipping time refers to the estimated time that it will take to deliver your order after it’s ready to ship (Please note this does not include time to process your order). Shipping time does not commence after your order is put through but begins the moment your order has been processed and is ready to dispatch via the our freight carrier..

1. Major City & Metro Areas (within Australia)

All in stock orders are generally processed on the same day the order was placed on business days for orders received before 12pm. Generally, orders are processed and shipped the same day or next business day.

Orders are typically received 1-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the nearest depot location.

2. Rural Areas (within Australia)

All orders are generally processed on the same day the order was placed on business days before 12pm.

Generally, orders are processed and shipped the same day or next Business day.

Packages below 2kg are usually received 3-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the local Australia Post depot.

International Shipping

The price for international shipping is AU$12.95 for orders equal to or below 0.399kg (399grams), and AU$22.95 for orders with a total weight equal to or above 0.4kg (400 grams).

All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 6-30 business days after shipping. 

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from your nearest delivery depot.

Please note in regards to all orders

– These expected delivery dates/times are based on carrier shipping practices, your destination, and the items in your order.

– Expected delivery dates are estimates. Orders can be delayed due to fraud verification or the time of the order being placed. Items that are not regularly stocked cannot be held to the expected delivery dates.

– Orders may be delivered in separate shipments.

– The order cut off times are based on normal Business Hours and exclude weekends and Holidays: Monday – Friday 12 pm

– When your order ships you will receive an email from us with a link to track your order.  If you receive your tracking number before 6 pm (AEST) it may not be updated on the Carrier’s website until that evening.

Due to large amounts of online credit card fraud, all orders are subject to approval by our payment verification department. We will notify you by phone or email should your order be delayed.

Returns Policy


We have a 14 day return policy, which means you have 14 days after receiving your item to request a refund for any defective products.

Returns and exchanges are only available for faulty items, goods not as described, or in some instances, for incorrect sizing.

Due to health and safety regulations, cockringshop.com.au cannot resell any returned or exchanged products.

This policy is in place to prioritise your well-being and ensure that you receive the highest standard of hygiene and quality in all products.

To be eligible for a refund, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging.

You’ll also need the receipt or proof of purchase. We do not issue refunds for change of mind or incorrect choice.

Under Australian Consumer Law, we are not obliged to accept returns for “incorrect choice” or “change of mind” so please choose your products carefully.

Any freight and insurance costs to return the item to us are at your expense. This includes the liability for any lost freight – send via registered post.

If your return request is accepted, we will provide you with all instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

Damages and issues

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items

We do not accept returns for any products that have change of mind, damaged products, or for products that have been used or do not have their original packaging.

Please get in touch if you have questions or concerns about your specific item.

Unfortunately, we cannot accept returns on sale items or gift cards.

Refunds

We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 7 business days.

Please remember it can take some time for your bank or credit card company to process and post the refund

Frequently Asked Questions

How does the Master Series Inertia Flexible Cum Thru Penis Plug enhance urethral stimulation during masturbation?
The hollow silicone shaft creates internal pressure against urethral walls while allowing natural ejaculation flow intensifying arousal through weighted stainless steel components that provide continuous stimulation during penis penetration and orgasm.
What makes the Master Series Inertia Flexible Cum Thru Penis Plug effective for extended wear during arousal?
Medical grade silicone flexes with natural penis movement while maintaining comfortable penetration. The lightweight design and smooth surface reduce friction enabling prolonged urethral stimulation without discomfort during masturbation sessions.
Why is the Master Series Inertia Flexible Cum Thru Penis Plug better for orgasm intensity than solid plugs?
Hollow construction allows ejaculation while maintaining internal pressure stimulation. This design intensifies climax sensations by combining urethral penetration with natural cum flow creating enhanced orgasm experiences during penis stimulation.
When should the Master Series Inertia Flexible Cum Thru Penis Plug be used for maximum penis stimulation?
During arousal buildup and throughout masturbation sessions for continuous urethral pressure. The device works best when inserted during early arousal stages providing escalating stimulation that peaks during ejaculation and orgasm.
Does the Master Series Inertia Flexible Cum Thru Penis Plug work for different penis sizes effectively?
Interchangeable head rings at 1.2 and 1 inch diameter accommodate various penis head sizes while the flexible shaft adapts to individual urethral anatomy ensuring comfortable fit and effective stimulation across different body types.

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Why Shop With the Cock Ring Shop?

FAST ORDER DISPATCH

We ship same day on all in-stock orders placed before 12pm! Free shipping on all orders above $200.

DISCREET PACKAGING

All of our shipments come in discreet packaging ensuring those nosy neighbours will never know!

INTERNATIONAL SHIPPING

We ship our full range of products worldwide with fast dispatch for orders before 12pm Sydney EST!