This S7008CB/HCP4ADGA bearing is a Super Precision angular contact bearing with 2 rubber seals, a 15° contact angle and the balls are hybrid ceramic, also known as bearing grade Silicon Nitride.This bearing is a universal fit double set of bearings with a light preload and a P4A precision rating. The bearing's dimensions are 40x68x15mm. The B design bearings are designed for high-speed operation and are best suited for lighter loads. Often used in Machine Tools, or other precision applications, these bearings are known for their high-speed capabilities, robust seals, and superior accuracy.