Reinsman Medium Loose O-Ring Tiny Twist BitReinsman Medium Loose O Ring Tiny Twist Bit Mouthpiece Width: 5 1 2" Bar Width: 1 8" Ring Diameter: 3 1 4" Ring Thickness: 1 4" Bit Material: Stainless Steel If you need more control this mouthpiece will tender up the corners of the lips and bars of the mouth and add control with light hands. Mullen relief mouthpiece creates even pressure across the bars and tongue to eliminate nutcracker effect. Stainless steel is a clean look and will resist rust.