Luigino 608 Inline Self-Centering Spacers:

Bearing spacers are essential for keeping the bearings from being squeezed by the frames. Higher quality spacers have precise dimensions, and better quality alloy is less likely to buckle or compress.

The Luigino Inline Spacer Kits come as a 8-pack of self-centering spacers. They can be used to replace your spacers or to get your wheels rolling smoother and with more control despite wheel hub consistencies.

Note:
Sold as a pack of 8