Very high quality bearings designed for skateboarding, with a low coefficient of friction, good durability, and high speed. Wider built-in spacers at the edges allow for improved proper alignment and spacing of your bearings while completely eliminating inner vibrations. They are especially necessary when subjected to hard carving and sliding, as longboarders do. Box includes: 8 ABEC 9 bearings with MUSHROOM built-in spacers Easily removable steel cover for easy cleaning. Speed rings