Custom Pro Pinstripe Mason Silva G3 Next Generation Skateboard Bearings. 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 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.