This set of miniature ball bearings is sized for 3 mm inner diameter, 6 mm outer diameter, and 2.5 mm thickness, providing smooth, low-friction rotation for shafts, axles, and moving parts in RC cars and trucks. Sold as a pair, they’re ideal for replacing worn bearings in wheel hubs, transmissions, differentials, or other components that rely on precision rolling support. These bearings help improve efficiency, reduce wear, and maintain consistent performance in areas with rotational motion. Their standard metric sizing ensures compatibility with many 1/10-scale RC models and assemblies.