This is a genuine Stan's No Tubes freehub body designed for use with the Stans Neo hubs. Features: Replacement freehub bodies include pawls and springs pre-installed E-Sync hubs use a fast 8.18 deg engagement with reinforced high-torque pawls HG 11sp road FH body requires a 1.8mm spacer (included) for use with a Shimano/SRAM 8-11sp HG mountain cassettes Specifications: Hub Model: Stans E-Sync & Neo Hubs Freehub: Sram/Shimano 11sp Material: Alloy Weight: 89g