FAST & SMOOTH Skateboard Bearing : High speed slow-friction skateboard bearing , pre-lubricated and perfect for downhill luge style skating, rollerblading or various spinners. Rolled smooth and fast out of the boxLONG LIFE : Durable wear skateboard bearings, measured idling for more than 120 seconds. Very fast and smooth. Skateboard bearings' Carbon steel for durability and resistance to deformity under heavy loadsMULTIPURPOSE USING of Skateboard Bearing : High quality skateboard bearing, work with all types of skateboards and longboardsThese bearings are good for the following: skateboards longboards cruisers mini cruisers mini skateboards inline skates roller blades roller skates