With the Evans EMAD System Pack, there's no limit on how you can hone your tone. The included EMAD batter and reso heads put your bass drum's attack, focus and sustain in your hands, allowing you to completely customize your sound. The EMAD clear bass batter features a single ply of 10-mil film, with the ability to adjust sustain, thanks to two interchangeable damping rings. On the other end, the EMAD reso head boasts an offset 4" microphone port in a single ply of 10-mil film, plus a foam damping ring around the port's external edge for greater control of your overtones. Both EMAD heads feature Level 360 technology.