The Light Up Penny Board Wheel 60*45mm with the ABEC 7 bearings is intended for penny boards and longboards. The wheel features built-in diodes so it lights up when spinning. However, no batteries are required as the diodes are powered by electromagnetic energy. The high quality ensures a long life span and provides comfort when riding on a flat and smooth surface. The high-speed ABEC 7 Chrome bearings provide smooth riding characteristics.