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8 mm Inner Diameter compatible with all 8mm axles.
11 mm Outer Diameter compatible with all wheel cores/hubs, including the really small ones found on many aggressive skating wheels.
10.1 mm Width compatible with most wheel cores/hubs:
When the bearing spacer width is too large the wheel core is not capture correctly by the bearings and the core can slide across the outer race of the bearings - which usually presents itself as a creaking sound.
When the bearing spacer width is too small the inner race of the bearing becomes offset from the outer race when the axle is over-tightened and and this presents itself as bearings that will not spin freely with significantly increased resistance when lightly spinning a wheel by hand.
The Using a 10.1mm width means these spacers are compatible with most wheel cores/hubs and will generally not result in either of the above issues.