Part for throttle control in the palm! You dont have to squeeze the grip, so you can reduce the burden on your hands while driving. Please check that there is no interference with the brake bar and no air movement before using. May not fit custom grips. Installation should be performed by a qualified mechanic or expertise We will not be responsible for any defects or damages caused during installation or use. Thank you for your understanding. Product design may change without prior notice in order to make improvements.