Evans 22" clear EMAD single-ply bass head contains two interchangeable damping rings that maximize attack and low-end without removing the head or reaching inside the drum.
 
Evans EMAD series features a 10mil of single-ply film providing an ideal balance of punch, power and low-end. The unparalleled industry standard Externally Mounted Adjustable Damping (EMAD) system allows the player to adjust attack and focus.