This is a Whitz Racing Products Hyperglide 22 5.0 Elite Full Ceramic Bearing Kit, a pack of high performance ceramic and stainless steel bearings that are compatible with the TLR 22 5.0 Elite kits. This full kit includes all bearings except steering bearings, and makes for an ideal choice for upgrading your vehicle, or replacements for maintenance. Features: Increased Drivetrain Roll Lower Friction Cooler Temps ABEC-5 Rating Si3N4 Ceramic Balls Stainless Steel Includes: (4) 10x15x4mm (2) 5x13x4mm (8) 5x10x4mm Compatibility: TLR 22 5.0 Elite