This product includes a set of four 12x18x4mm ball bearings designed for use in compatible Losi RC vehicles. These precision bearings help reduce friction in rotating components such as drivetrain shafts, wheels, and gear assemblies, improving efficiency and overall performance. The sealed design helps protect against dirt and debris while maintaining smooth, consistent operation under demanding conditions. Built for durability, they are intended to handle high RPM use in both racing and bashing environments. Ideal for maintenance, rebuilds, or replacing worn bearings to restore optimal performance.