Bronson Speed Co. Ceramic Bearings and Cleaning Unit.Bronson Speed Co. Next Generation Ceramic Bearings designed for today's skateboarding.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 & breakageStraight Edge Frictionless Shields.Pop off resistant.Holds oil in, dirt and moisture out.Easy to clean.Micro Groove Raceway Surfaces.Linear micro-groove 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.High Speed Ceramic Oil.Nano-ceramic compounds for wear protection.moisture, rust, corrosion resistant.Factory Fresh Quality.Nitrogen filled shrink wrap, reduces metal & oil oxidation until ready to be ridden.Bearing cleaning unit case, 8 ceramic bearings, 4 spacers, 8 washers, and 8 extra replacement shields.