Whitz Racing Products RC10 B7/B7D Hyperglide Full Ceramic Bearing Kit, WRP-AEB7-HGFK This is a Whitz Racing RC10 B7/B7D Hyperglide Full Ceramic Bearing Kit, a pack of high performance ceramic and stainless steel bearings that are compatible with the Team Associated RC10 B7/B7D platform. This full kit includes all bearings except steering ball bearings, and makes for an ideal choice for upgrading your vehicle, or replacements for maintenance. NOTE:Whitz Racing recommends every few track days to check for any necessary maintenance needs. If the bearings feel gritty or have reduced roll, remove bearings and clean them with a citrus-based degreaser and lightly oil with a premium high temperature lube/oil such as TDK Bearing Oil. Car brake parts cleaner will ruin your bearings and is NOT recommended.DO NOT include steering bearings or ball differential bearings. Features:Increased drivetrain rollLower friction and cooler temperatureABEC-5 ratingCeramic ballsStainless steel construction Includes:(4) 10x15x4mm Ball Bearings(2) 5x12x4mm Ball Bearings(12) 5x10x4mm Ball Bearings