These minimize drag on your bearings. The solid aluminum construction dissipates head and will last longer than other plastic. This spacer is for use with micro (size 688) bearings and 8mm inline axles.
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Color: Silver; Material: Aluminum; Size: 11 x 8.1 x 10.3mm / 0.43 x 0.32 x 0.41(OD*ID*H); Packing List: 8 x Spacers Advantage: It has the
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