[Dimension]: 64mm wheel diameter, 23.5mm wheel thickness, 82A hardness; white plastic spacer inner diameter 6mm. NOTE: the white plastic spacer is fit for 6mm axle, but if you pull it out, the wheel would be fit for 8mm axle. [Light Duty Wheels]: These wheels are mainly used for luggage, training wheels or indoor skating. Not recommended to use on uneven ground. [Durable Material]: These roller skate wheels adopted superior PU, wear-resistant & solid. Designed with 82A hardness, offers durable use experience. Its high performance bearings ensure a smooth and comfortable ride. If the inner buckle of the wheel core is loose, it is recommened you could add a little bit of paper between the white plastic lip and the bearing to better fix the wheel. [Ultra.
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