Steel ball bearings, Set of 8 Built in spacers, Speed rings The Bear Spaceballs 8mm Bearings offer the same durability and speed as the ceramic Spaceball bearings at half the cost. While they won't perform like a ceramic bearing, they do feature the same built-in spacer design and feature the same speed rings to keep you racing at high speeds for longer. Steel ball bearings, Set of 8 Built in spacers, Speed rings