Features: Uniform speed. Using high quality bearing steel material. The dust effect is obvious, the stability is strong, durable. Has the characteristics of low density, high hardness, wear resistance. High quality, long use time. Ideal changing parts for skate bearings. Specification: Material: steel Model: 608-RS Outside Diameter: 22mm Inner Diameter: 8mm Thickness: 7mm Color: red & silver Package included: 1 x Roller Skates Ceramic Ball Inline Skate Bearings Drift Plate Notes: Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. Thank you!