These Schumacher Racing Products factory replacement open ball bearings measure 4x8x2mm and are sold as a pair. The open design means there is no shield or seal, making them easy to clean and relubricate in the field. They are a direct replacement for Schumacher 1:10 scale platforms that use this metric bearing size. Features: 4x8x2mm metric sizing Open (unshielded) design for easy servicing Sold as a pair Metal construction 7/7/26 cs