About This Straight Edge, Removable Frictionless Shields: Pop off resistant, hold oil in, dirt and moisture out, easy to clean. Deep Groove Raceways: Balls roll deep in raceway channels. Reduces side impact damage & breakage. Micro Groove Raceway Surfaces: Linear micro-groove surfaces improve bearing lubrication, speed and spin. Next Generation Bearings, Designed for Today's Skateboarding. The fastest, strongest, longest lasting, longest spin skateboard bearing ever made. - Balls Out Technology: Eliminates shield and cage contact on impact for a go fast, stay fast bearing. - High Speed Oil: Custom engineered light oil lubricant is water, oxidation and corrosion resistant for extended wear protection. - Factory Fresh Quality: Nitrogen filled shrink wrap, reduces metal & oil oxidation until ready to be ridden. - Set of 8 Bearings Overview Brand : Bronson Speed Co Material : Alloy Steel Item dimensions L x W x H : 1 x 1 x 1 inches Item Weight : 3.2 ounces Bearing Number : Alexis Ramirez