This is a genuine Stan's No Tubes freehub body designed for use with Stans Neo & E-sync 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 Includes Micro Spline specific end cap, spacers & seals Specifications: Hub Model: Stans E-Sync & Neo Hubs Freehub: Shimano Micro Spline Material: Alloy Weight: 82g