Bronson Speed Co. G2 Next Generation Bearings designed for today's skateboarding. Deep Groove Raceways -Balls roll deep in raceway channels -Reduces side impact damage & breakage Straight Edge, Removable Frictionless Shields -Pop off resistant -Hold oil in, dirt and moisture out -Easy to clean High Speed Oil -Custom engineered light oil lubricant is water, oxidation and corrosion resistant for extended wear protection Case=10 Box/8 Bearings, 4 Spacers, & 8 Axle Washers