20" EMAD BTR CLEAREvans clear EMAD batter series features a 10mil of single ply film providing an ideal balance of punch, power and low end. The EMAD 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 system allows the player to adjust attack and focus. 20" drum head made using a single ply of 10mil film Externally