The TCS 727, 46RE, 47RE, 48RE, 47RH Rear Drum is made from 6061 T6 Billet Aluminum. The rear drum is made from 6061 T6 billet aluminum. 60% lighter than the stock rear drum – 1.45 lbs. versus 3.65 lbs. A direct replacement for the O.E.M. drum. Ideal for both street and strip.