E-sync hubs are built to last, including under the higher torque and weight of eBikes. A 6066 alloy shell, heat-treated steel ratchet ring, reinforced pawls, and full Enduro bearings rovide brute strength, while 8.18 engagement provides the speed.Fits E-sync hubs and includes pawls, springs, pawl retainer, 0.5mm freehub spacer, 1.8mm cassette spacer, and freehub seal. Bearings are pre-installedAlso compatible with Neo and Neo Ultimate hubs as a more durable upgradeItem SpecificationsCassette Body TypeSRAM XDRMaterialAlloy Stan's No Tubes E-Sync Freehub Body Freehub Body UPC: 847746064558