What is a urethral sound trainer set and why are the sizes graduated? Urethral sounds are slim rods inserted into the urethra for sensation. A trainer set provides several diameters so the user can begin with a thin rod and move up in small steps over time, instead of starting too large. Each sound in this set has a different diameter at each end, so three rods give six sizes. Sounding carries real risk of injury and infection. It calls for clean equipment, sterile lubricant, patience and no force at any point.
Invasion trainer set: six sizes on three silicone sounds
The Invasion set contains three urethral sounds made of phthalate-free, non-porous silicone. Each rod is 8 inches long and double-ended, with a slightly different diameter on each side. The smallest measures 0.19 and 0.23 inches, the medium 0.27 and 0.32 inches, and the large 0.34 and 0.38 inches. That gives six steps to work through.
Unlike steel sounds, these are flexible and bend to follow the body. The non-porous silicone is easy to sterilize between uses, and at 8 inches each rod leaves plenty of length to hold on to. All three rods are blue.
Best for: People curious about sounding who prefer a soft, flexible rod to rigid steel, and those who want small steps between sizes. The thinnest end, at 0.19 inches, is the place to begin. This is an advanced kind of play that needs care and preparation.
At a glance: 3 double-ended sounds · 6 sizes · Silicone · 8 in long · Flexible
Key features
| Six graduated sizes |
Diameters run from 0.19 to 0.38 inches across the three sounds. |
| Double-ended rods |
Each sound has a different width on each end, so one rod covers two steps. |
| Flexible silicone |
The rods bend with the body instead of holding a rigid line. |
| Non-porous material |
Phthalate-free silicone that is easy to sterilize. |
| 8 inch length |
Each sound is 8 inches long, leaving plenty to hold. |
Specifications
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Length (each sound): 8 in
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Small sound diameter: 0.19 in and 0.23 in
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Medium sound diameter: 0.27 in and 0.32 in
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Large sound diameter: 0.34 in and 0.38 in
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Material: Silicone
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Color: Blue
In the box
- 3 double-ended silicone urethral sounds
How to use
Sterilize the sounds and wash your hands and genitals thoroughly. Start with the 0.19 inch end of the smallest rod. Coat it generously with sterile, water-based lubricant and put a little at the urethral opening. With the penis soft or semi-soft, hold it upright and let the sound slide in slowly under light guidance. Never push. If you meet resistance or feel sharp pain, stop and withdraw gently. Keep a firm hold on the free end at all times. Stay on one size for several sessions before moving up. Stop and seek medical advice if you see blood or have pain that lasts.
Care
- Use sterile, water-based lubricant only. Silicone lubricant can damage silicone sounds.
- Wash with warm water and mild soap, then sterilize before and after every use.
- Let the sounds air dry fully on a clean surface.
- Store them in a clean, closed container away from other toys.
- Do not share sounds between people.
More on materials in our material safety guide.
Frequently asked questions
What sizes are in the set?
Three sounds, each 8 inches long, with two diameters apiece. Small is 0.19 and 0.23 inches. Medium is 0.27 and 0.32 inches. Large is 0.34 and 0.38 inches. Together they give six steps from thinnest to thickest.
Is this set suitable for beginners?
It is designed as a trainer set, and the 0.19 inch end is slim. Sounding itself is not beginner play, though. Read up on technique and hygiene first, go very slowly, and never force a sound past resistance.
Why choose silicone over steel sounds?
Silicone sounds are flexible and bend to follow the body, which some people find more comfortable. Steel sounds are rigid and heavier. Because silicone flexes, guide it gently and keep hold of the outer end the whole time.
What lubricant should I use?
A sterile, water-based lubricant, ideally in single-use packets. Ordinary lubricant from an open bottle is not sterile. Avoid silicone lubricant, which can damage silicone, and avoid anything with numbing or warming ingredients.
How do I clean the sounds?
The silicone is non-porous and easy to sterilize. Wash each sound with mild soap and warm water, sterilize it, and let it dry fully before storing it in a clean container. Clean before use as well as after.
Start with the smallest size
Add the Invasion Silicone Urethral Sound Trainer Set to your cart for plain packaging, privacy-safe billing and a mystery gift in every order.
For adult use only. Read the instruction manual before first use. Specifications are the manufacturer's.
