The ALUMINUM spool is OVER 4 POUNDS LIGHTER than the standard steel spool!!! This listing is for one NEW Andrews Motorsports Toyota 10 bolt 6.7 ALUMINUM spool as shown in pictures 1 through 5. This spool is for the standard rear gears 3.30 through 4.30 as used in the Legends Race Car, Pro Challenge Race Car, Thunder Roadster and other race cars using this series Toyota rear gear. It may work in other applications but that is for the buyer to determine. Never installed.