Evans BD20EMADCW EMAD Coated Bass Drumhead - 20"EMAD Coated bass drumheads balance power, punch, and low end, while letting you hone your tone with EMAD. EMAD heads feature a single ply of 10mil film, complete with EMAD foam rings to adjust the heads attack, focus, and sustain. Sonically, this coated bass drumhead has a balanced attack, very short sustain, and moderate tone. This coated head also features Level 360 Technology. Features EVANS EMAD Coated bass drumheads are made with a ply of 10mil