Made from 6061-T6 billet aluminium. Available in 5 colours.morn Replaces OEM original spacers. Designed not to fall out when you change wheels. Eliminates that third hand when changing wheels. CNC machined from billet aluminium. Fitment. RHK Yamaha Blue Axle Spacers Rear YZ 250 F 2009-2022 RHK Yamaha Blue Axle Spacers Rear YZ 450 F 2009-2022 RHK Yamaha Blue Axle Spacers Rear YZ 250 FSP Monster Energy Racing Edition 2021-2022 RHK Yamaha Blue Axle Spacers Rear YZ 450 FSP Monster Energy Racing Edition 2021-2022