Master Series Invasion Silicone Urethral Sound Set, A Softer Feel

A Softer Feel, With Carefully Defined Choices

The appeal of Invasion is in the material and the details. This Master Series silicone urethral sound set brings three flexible rods together, with a different diameter at each end for six clearly defined choices.

The silicone has a smooth, non-porous surface and a yielding feel in the hand. Each sound has rounded ends and a long, simple shape, keeping the focus on the feel of the material rather than a motor or a complicated mechanism.

If specialist sensation toys are already part of your interests, Invasion offers a softer style to consider alongside the measurements you know suit your needs. Take your time choosing. There is no finish line hidden in the box.

“Three flexible sounds, six end measurements and room to choose for yourself.”

Master Series Invasion Silicone Urethral Sound Set Key Features:

✅ Three double-ended sounds provide six different end diameters in one set.

✅ Flexible silicone gives each rod a yielding feel rather than a rigid metal construction.

✅ Smooth, rounded ends keep the shape simple and easy to inspect.

✅ Phthalate-free, non-porous silicone is the material throughout the sounds.

✅ Each rod measures approximately 20.3cm in total length.

✅ No batteries, charging, settings or separate moving parts.

Product Details

Invasion is a three-piece urethral sound set, with two end sizes on each rod. The smaller, middle and larger rods each have their own pair of measurements, so you can compare the options clearly rather than relying on a vague size label.

The silicone construction is the defining tactile feature. Each sound can bend, as shown in the product photos, while its smooth surface and rounded ends keep the outline uncomplicated. Flexibility changes the feel of handling the set; it does not make urethral play risk-free.

The rods share the same overall length, with the end diameters providing the differences. The diameter table below lets you compare all six ends at a glance. Those are choices within the set, rather than a sequence you need to complete or a target to work towards.

There are no motors or control parts built in, and no external retaining handles or flared stops. This is a specialist adult novelty set whose suitability needs careful consideration. It is not a medical instrument or a treatment for urinary symptoms.

Experience Level

For adults already informed about the risks and hygiene requirements of urethral play. The word “trainer” in the product’s name does not make it a low-risk beginner toy. A urologist or qualified sexual-health clinician can advise on individual suitability, sizing and preparation before use.

Best For

Someone who knows their preferred sound measurements and is interested in comparing a flexible silicone design. The three rods keep the set straightforward, with two end sizes on each and a consistent overall length.

It also suits a considered approach to choosing specialist sensation toys: looking closely at the shape, material and actual dimensions before deciding. We reckon feeling comfortable with your choice matters much more than collecting the biggest number.

For A Preference For Flexible Silicone

If the feel of silicone is what draws your interest, Invasion puts that material at the centre of the design. The smooth surface, rounded ends and flexibility give the set a simple tactile character, with no added functions to distract from those details.

The double-ended format also appeals if you like having clearly specified options in a compact set. You can compare each pair of diameters and choose according to your own established needs, with no expectation to use every end.

Product Information & Measurements

ℹ️ Brand: Master Series

ℹ️ Model: Invasion Silicone Urethral Sound Trainer Set

ℹ️ Material: Phthalate-free, non-porous silicone

ℹ️ Colour: Blue

ℹ️ Length: Approximately 20.3cm (8 inches) per sound

ℹ️ Format: Three double-ended rods, with six end diameters

ℹ️ Power: None required

What’s Included

ℹ️ 1 x Master Series Invasion set containing three silicone urethral sounds in retail packaging

ℹ️ The anatomical demonstration model shown in the photos is not included.

Care & Important Preparation

Urethral play carries risks including injury, infection and scarring. Get qualified advice on suitability, sizing, lubrication and sterilisation before use. Never force a sound or treat increasing size as a goal.

For urethral contact, water-based lubricant must also be sterile and specifically suitable for that use; ordinary pleasure lube is not automatically appropriate. A general-purpose toy cleaner is not a substitute for a suitable sterilisation process. Confirm the correct method for this set before internal use, and keep cleaned items protected from contamination.

Stop if there is pain, resistance or bleeding. Seek urgent medical help for a retained sound, difficulty passing urine, fever or significant pain; do not try to retrieve a stuck item with other tools.

Tip: Keep the end-size information with the set so the rods remain easy to identify. Clear measurements and a considered choice are far more useful than rushing to a different size.

Shop With Confidence

Invasion brings a smooth silicone feel and a clearly defined range of end sizes to a simple three-piece design. If you are choosing specialist sounds with care, the material, flexibility and full measurements give you useful details to consider.

We have been helping Aussies find their kind of fun for over 25 years, with a warm welcome, straight-up advice and a little cheek. Your interests deserve thoughtful information and a choice you feel good about.