These high-quality Rubber Shielded Ball Bearings make ideal replacement parts for your ARRMA vehicle.Features:Premium ball-raced bearings for ultra-smooth operation in all conditions - Precision manufactured for fast and easy fit and consistent servicing - Manufactured to consistent tolerance for safe and secure assembly - High-quality rubber shields for enhanced protection against the elements - Keeping dirt, water, and dust out, and lubrication in, means more time bashing and less time wrenching SPECIFICATIONS: Inside diameter: 12mm Outside diameter: 18mm Thickness: 4mm  Includes:2 x Ball Bearing 12 x 18 x 4mm