Item Type: Skate Wheels Material: PU, Rubber, Steel Gross Weight: 371g / 13.1oz Color: Black Product Diameter: Approx.69mm / 2.7in Applicable: for skates inline pulley, etc. Package List 4 x Wheel 1. White plastic spacer is suitable for 6mm shafts, but if you pull it out, the wheel is suitable for 8mm shafts. 2. Due to manual measurement, please allow an error of 13mm. Please make sure you don't mind before ordering.3. Due to different shooting lights and differences between monitors, the picture may not reflect the actual color of the object. Please make sure you don't mind before ordering, thank you 1Good Shock Absorption Effect: This skate wheel has good shock absorption effect, strong grip, not easy to slip, safe and use with confidence. 2Flashing Wheels: Use the flashing skate wheels to make you look cool and stylish while skating at night and giving you even more fun. 3Quiet: This wheel uses ultra quiet, which greatly reduces the noise, and has good comfort performance, giving you a perfect skating experience. 4Replacement Parts: This wheel can be used as a replacement part for skates to replace the damaged original parts, and it is easy to install. 5Multi Usage: Fits most inline skateboards, casters and even luggage, perfect for daily practice, leisure, art skating and hockey skating, very convenient and practical.