Adjustable tension design is a universal fit for most commonly used throttle sizes. Made of Nylatron® thermoplastic resins for wear/impact resistance, tensile strength, light weight and high cold/heat tolerance. Adjustable tension gear design is easy to install or remove with one hand. Set the required tension as needed when changing to new throttle size. Two easy ways for engaging to set speed using your index finger or thumb until it rests over your brake lever. Easy disengaging by twisting the throttle clockwise or forward as you normally reduce the speed. Comes with rubber ring for added friction when in use. NOTE: DO NOT use Easy cruise throttle control if front bottom flat surface (in the direction of the brake lever when installed) does not sit properly over the brake lever. Front bottom flat end surface should cross over the front side of brake lever by a few mm to ensure proper operation while riding.