The Evans EMAD Resonant Black Bass Drumhead has earned a solid rep among drummers of all styles for its versatility and killer tone. With the EMAD series drumhead, you are in the driver's seat with the ability to shape its finer tonal features. The EMAD (Externally Mounted Adjustable Damping) system consists of a foam-dampening ring held in place by an external plastic sleeve around the 4-inch mic port, which lets you utilize the ring for controlling overtones as well as enhancing pitch focus and attack. And with a single ply of 10mil film, the EMAD drumhead arms you with an already enhanced attack, focus, and durability.