This Schumacher Racing Products factory replacement ceramic ball bearing measures 6 x 12 x 4mm and is sold as a pair. Ceramic bearings are a common upgrade choice for competitive RC racing due to their reduced friction compared to standard metal bearings. The metal outer races feature orange rubber seals to help keep out dirt and debris. Features: 6 x 12 x 4mm metric sizing Ceramic ball construction Orange rubber sealed races Sold as a pair 7/7/26 cs