Bearing Cleaning Unit Package – Case doubles as a bearing cleaning unit by following the included instruction sheet. High Density Ceramic Balls – Precision made, Hot Isostatic Pressure Sintered (HIPS) Silicon Nitride ceramic balls are super-fast, smooth rolling, and durable for extended use. Deep Groove Raceways – Balls roll deep in raceway channels – reduces side impact damage & breakage. Straight Edge Frictionless Shields – Pop off resistant – hold oil in, dirt and moisture out – easy to clean. Max Impact Cage Design – non- distortion custom cage keeps the balls precision spaced & oil circulating. Micro Groove Raceway Surfaces – linear micro-groove surfaces improve bearing lubrication, speed and spin. High Speed Ceramic Oil – Nano-ceramic compound for wear protection – moisture, rust, & corrosion resistant. Balls Out Technology – Eliminates shield and cage contact on impact for a go fast, stay fast bearing. Factory Fresh Quality – Nitrogen filled shrink wrap, reduces metal & oil oxidation until ready to be ridden. Package inludes: Bearing cleaning unit case, 8 ceramic bearings, 4 spacers, 8 washers, and 8 extra replacement shields