Metal sounds are good for pros, but they require a lot of knowledge and skill. Oxballs Urethral Sounds are a huge advance in penis-hole stuffers because they are made from soft, flexible medical grade silicone. Easy to insert, begin with the smooth urethral shaft that gets thicker the closer to the hook that you get. When you have mastered this one, you can move onto the three tiered urethral sound where each level gets progressively thicker the further in you go. The hook on the 4.75 inch long urethral sounds allows you to maintain the best possible grip and prevent from going in too far. Try twisting them round when they are inside your cock and imagine the feelings you will get! Choose from Black or Red.