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.
Bauer S19 Hi-Lo Inline Axle and Spacer Kit
12FiFties ORRSOM Electric Longboard with URBAN TREADS Pneumatic Tyres TWIN Motor - CUSTOM
100mm CV Joint Spacer – Drivesport
Thru Axle Spacers The Robert Axle Project
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
PATIKIL Inline Axle Bearing Spacers, 8 Pack Skates Speed Spacer Hardware Aluminum for 8mm Axle Roller, Silver
Phuzion Krypton Chrome 100 – Powerslide
Performance Manufacturing Corporation
Bearing Press Speed Spacer, 17mm x 35mm
Bicycling Catalog - Trinity Bikes
Indoor Cycling - New Mexico Bike N Sport
Remote Locking 8X8 Axle DIY Kit for Scale Off-Road 1/10 to 1/14 Trucks for R/C or RC - Team Integy