Box Prime 9 Groupset BX-DT4-08AMW-KIT

- Includes cassette, derailleur, shifter and chain\n- Single shift options are for eMTB to keep the user from shifting multiple gears under load, significantly reducing the rate of bent teeth and broken chains\n- Cassette fits HG splined Shimano/SRAM 8-10sp freehubs \n- 3rd party web sales must be an Authorized Dealer