Remo Powersonic Coated Bass Drum Heads are made of two plies of Mylar film (7-mil and 5-mil), featuring two specifically placed internal dampening rings and the External Snap-On Dampening System (ESDS). This head controls your mid range and focuses low end.
The ESDS system lets you change the sound of the drum on the fly, essentially giving you that "pillow" sound when attached.
