TF727 727 Billet Aluminum Direct Drum and Piston. The drum is made from 7075 T6 billet aluminum. Kit includes a new steel pressure plate teflon sealing rings and, a TCS billet aluminum piston. Safer than O.E.M. cast iron drum. 57% LIGHTER than the O.E.M. drum 3-1/4 lbs versus 7-1/2 lbs. Will hold up to 5 friction plates versus only 4 in a O.E.M. drum. Designed with a serviceable and replaceable ring sleeve and bushing.