Evans BD22REMAD 22 Inch EMAD Resonant DrumheadWith an offset 4 microphone port in a single ply of 10mil film plus a foam dampening ring around its edge, the Evans EMAD Resonant series gives you greater control of your overtones, so you can enhance your pitch, focus, and attack. Specifications Treatment: Uncoated Ply: 1 Thickness: 10mil Technology: EMAD Made using a single ply 10mil film The perfect resonant head for use with the EMAD series batter heads A fixed, internally mounted black plastic