Sector 9 Race Bearings Black Ball Ceramic

Set of 8 Black Ball Ceramic bearings and 4 spacers.

Rubber coated shield is removable for easy cleaning. Ceramic bearing balls weigh up to 40% less than steel bearing balls. This reduces centrifugal loading and skidding, so hybrid ceramic bearings can operate 20% to 40% faster than conventional bearings. This means that the outer race groove exerts less force inward against the ball as the bearing spins. This reduction in force reduces the friction and rolling resistance. The lighter ball allows the bearing to spin faster, and uses less energy to maintain its speed.