1、Stable Rotation Speed: stable rotation speed, low friction, low noise, high work efficiency, and it is not easy to get hot during the process. 2、Smoothing Process: The appearance smoothing process is mature, the bearing appearance is glossy and flat, and the color is bright. 3、High Temperature Resistance: Bearings skate board has uniform hardness and wear resistance, high temperature resistance, strong load resistance and long service life. 4、Carbon Steel Material: Roller skate bearings are made of high quality carbon steel material, which is strong and durable, not easy to discolor or rust, and not easy to break after repeated use. 5、8PCS: 8PCS, multiple packs, fine workmanship, suitable for replacement, suitable for small scooter wheels, skate wheels. 8 x Roller Skate Bearings Item Type: Roller Skate BearingsMaterial: Carbon SteelUsed For: Small Scooter Wheels, Roller Skate WheelsSize: Approx. 7 x 22 x 9mm / 0.3 x 0.9 x 0.4in