Lightweight and silky smooth 7075 alloy road racing hubs. Polished silver alloy for retro style Front has 2 sealed bearings and alloy axle Rear features 6 pawls with double tips giving 12point simultaneous engagement on a 30-point drive ring (12 degree engagement), CNC 7075 hard aluminum cassette body with Shimano HG splines, plus 4 sealed cartridge bearings and a lightweight alloy axle HG 11sp road: Compatible with HG splined Shimano/SRAM 11sp cassettes. Also compatible with Shimano/SRAM 810sp cassettes with spacer