Evans BD18EMAD 18 Inch EMAD Batter Clear DrumheadAdjust attack and focus easier with this single ply 10mil head. Balance your power, punch, and low end. The industry standard EMAD (Externally Mounted Adjustable Damping system) from Evans is for drummers who demand the best. Specifications Treatment: Clear Ply: 1 Thickness: 10mil Technology: EMAD Made using a single ply of 10mil film Externally Mounted Adjustable Damping system allows the player to adjust attack and focus Very versatile head for all