This gag leaves your partner speech-less while still having access to their mouth as it remains open! The gag will remain securely around their head with the belt style buckle. Because the strap is adjustable, it can fit a wide range of people. The gag part its self is an O shaped ring which measures approximately 1.75 inches in diameter, outside, while the inner hole is 1.3125 inches in diameter. The ring is welded onto two protruding rectangular shaped pieces onto which the strap is attached to. This gag will be very effective and comfortable for the handling of your sub.