The EMAD series features a single ply of 10mil film providing a great balance of deep low, power frequencies. This has become an industry standard Externally Mounted Adjustable Damping (EMAD) system allows the player to adjust attack and focus. The coated surface provides more low register and attack. The sound is so deep with the perfect attack. You will make this your Bass Drum head of choice. Elizondo Music is very proud to be an Evans Authorized dealer with full factory warranty.