This Fetish Fantasy Extreme Silicone O-Ring Gag is precisely what you need to keep your sub quiet while keeping their mouth wide open for anything you wish to introduce! The metal O-ring is encased in medical-grade silicone that is taste-free and gentle on the teeth and gums, all while being sturdy and durable. The belt-like straps, also crafted from Elite Silicone, easily adjust to fit most sizes.