The Timber Model YEW bell is designed to alert other nearby trail users of your presence. Using a spring-loaded on/off switch, the bell can be turned on, ringing activated by the bikes motion, or it can be silenced when not needed. The Timber bell offers a friendly way to warn other trail users of your approach. - Spring loaded piston on the on/off lever for smoother shifting - Fits 35mm bars (includes shims for standard 31.8mm and 22.2mm bars) - A hinge pin in the bar clamp provides easier mounting and secure holding power