Remo Powersonic Coated Bass Drumhead, 20" Powersonic Bass, Coated, with Snap-on dampening system Constructed of 2 ply 7 mil MYLAR with two specifically placed subsonic dampening rings, this head comes with an external snap-on dampening system and FALAM Slam for more attack Powersonoic lets you easily customize your sound 3 ways for different playing situations without removing the head from the drum