Evans BD22EMADHW Evans EMAD Heavyweight Clear Bass Drum Head 22 InchEvans EMAD Heavyweight series features two plies of film. The combination of two identical plies of 10mil film provides maximum durability and a compressed attack while maintaining a wide dynamic range. The EMAD Heavyweight contains two interchangeable damping rings that maximize attack and low end without removing the head or reaching inside the drum. The unparalleled industry standard Externally Mounted Adjustable Damping (EMAD) system allows the