This is one R6-2RS bearing. This bearing will work with many hubs. It has an OD of 7/8" (22.2mm), and ID of 3/8" (9.5mm) and thickness is 9/32" (7.2mm).
This is one bearing; if you need a pair, buy 2!
Be sure to measure your old bearing to ensure this will fit. The appearance of this part may vary slightly from the photo.
