[High-quality material]-Made of material, designed to provide good grip and speed under hardness conditions, and has excellent durability. [Diameter]-equipped with ABEC 9 bearings and gaskets, bearing inner diameter is 8 mm, bearing outer diameter is 22 mm [95A hardness, indoor performance] - 95A hardness, providing grip, speed and durability. These long-lasting art wheels are of competitive quality, and the formula rolls smoothly while providing excellent grip on the floor. Suitable for skating style: jam, , speed, racing. [] - The inner and outer edges of the wheel hub are oversized, thereby reducing the polyurethane content of the wheel. This makes the stop operation simple and provides excellent response. There is space in the middle of the wheel hub to accommodate more polyurethane, provide grip, increase control and improve the riding experience. colour: Black+red Material: PU size: 58 x 39cm Package Contents: 40 x Roller skate wheel(Bearings include) 5 x Mounting wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.