Bronson Speed Co, Next Generation Skateboard Bearings, 8 Count Deep Groove raceways balls roll deep in raceway channels reduces side impact damage & breakage Straight edge frictionless shields pop off resistant holds oil in, dirt and moisture out easy to clean Micro Groove raceway surfaces linear microgroove surfaces improve bearing lubrication, speed and spin Max impact cage design non distortion custom cage keeps the balls precision spaced & oil circulating Balls out technology eliminates shield and cage contact on impact for a go fast, stay fast bearing