These wheels are made of PU, and the wheels of this material will provide you with excellent balance. The new fat model design makes the wheels meat more plump and has a higher utilization rate.The unique triangular inner buckle hub makes the wheel more stable when sliding.It is a professional and cost-effective roller skating flat flower wheel.Size: kid: 64mm, 68mm, adult: 72mm, 76mm, 80mmHardness: 82AWheel material: PUFeatures: high elasticity, wear resistance, strong gripColor: blue, redNote:Due to the difference in lighting when shooting and your own equipment, the color of the item may vary slightly. There are some small errors in human measurement. SIZE -- Aldult: 72mm, 76mm, 80mm. Kid: 64mm, 68mm. HIGH PERFORMANCE -- Performance-enhancing 82A durometer. UNIQUE DESIGN -- The new design makes the wheel meat more plump and more efficient. The triangular inner buckle hub is more stable. long-lasting FOR MILES OF USE -- Roller are made of PU, and the wheels of this material will provide you with excellent balance. This urethane performs great on wood, concrete and sport tile indoor surfaces. for many occasions, indoor, outdoor, asphalt roads, parks. Department other Manufacturer Generic