【View video for Floating Emblem perfromance】 The emblem keep stay and no rotation when the vehicle runing. 【View video for Floating Emblem perfromance】 The emblem keep stay and no rotation when the vehicle runing. 【Auto light】Floating caps will generate blue light when vehicle runing speed > 25km/h. Use the kinetic energy of the wheels to generate electricity.No need bettery. 【Pack inculde】4pcs floating center Caps Size :75mm diameter. free tool: one screwdrive 【Simple installation】remove the old center caps and replace with the new caps,provide free tools 【Fit for orignal wheel】100% Fit to orignal wheel.Not fit for refit wheel.Not use for steel wheels with snow chains.