Mr-S-Leather carries these medical grade silicone chastity cages in 2 styles. The Smooth inside sheath and the Spiked-inside Punisher. You can lock your boy up or yourself, in the Smooth inside sheath (CB071) and wear it comfortably for weeks at a time. The spiked Punisher (CB072) starts to get annoying after a few hours but not unbearable. The thick silicone ball splitter on both styles separates your balls to either side of the strap. Both styles are easy to wash and hypoallergenic. Their solid closing mechanism leaves the wearer in a flexible yet secure device, very comfortable to wear as it fits the male anatomy perfectly. The sheath may be crushed yet remain unbroken. Completely invisible under any clothes. The cock ring size is about 1 3/4 inches in diameter though can be adjusted from 1.5-2", so this one size should fit most guys fine. The "Punisher" sheath (CB072) is equipped with 25 inside spikes made of flexible silicone spikes which will bite into the head of your cock as soon as you start to get hard. The spikes are made of flexible silicone, but prolonged usage may provoke extreme sensations and annoy the piss out of your boy. This is the device to use to punish him for a few days or if he's a Pig, keep him locked up in this one all the time. As in any of these chastity devices, including the CB3000 series, they are not escape proof. With some maneuvering and pulling you can slip them off. It's the nature of plastic or silicone. But these are so comfortable to wear, you won't really want to get out of them. Plus since these are made from a soft thick silicone, they can't crack or break like the plastic sheaths may. If you enjoy Chastity as part of your sexual play, it will quickly become one of your favorites to wear for long periods of time. Lock included. Measurements; Total length: 3.7 inches Ring length: 1.18 inches Sheath length: 2.53 inches Tube diameter: 1.30 inches # of air holes: 7 Min. silicone thickness: 0.15 inches