10 PACK 5x10x4mm Rubber Shielded Ball Bearings MR105-2R - Apex RC Products #1920R 1 package includes ten (10) bearings. Each bearing measures: inner diameter: 5mm / outer diameter: 10mm / width: 4mm. Direct oem replacement for traxxas, hpi, associated, tamiya, kyosho, and many other popular vehicles. Rubber seals keep dirt out! Precision steel balls.