This Fetish Fantasy Extreme Silicone O-Ring Gag is exactly what you need to keep your sub quiet while keeping their mouth wide open for whatever you wish to put in it! The metal O-ring is encased with medical-grade silicone that is taste-free and gentle on the teeth and gums while remaining sturdy and durable. The belt-like straps. also made of Elite Silicone. easily adjusts to fit most sizes.