Oust Bearings: MOC 5 Tech (set of 8) Unique bearing design allows for tighter tolerances, unlike popular brands. High Rockwell material hardness, and high surface polish for increased speed, performance, durability, and low friction. High strength carbon steel ball cage that is ideal for street skateboarding. 2 Removable buna rubber seals for superior bearing protection and easier cleaning. Made in the USA  Beyond ABEC 5