Product Information: Easily maximize your attack and low-end with two interchangeable damping rings. Maintain a wide dynamic range plus maximum durability and a compressed attack with two identical ply of 10mil film. The EVANS EMAD Heavyweight series is here to take your playing to the next level. Product Features: Made using two identical plies of 10mil film Externally Mounted Adjustable Damping system allows the player to adjust attack and focus Very versatile head for all music genres; a true working drummer's choice All EVANS drumheads are designed, engineered, and manufactured in the USA For more information and specifications, please refer to the manufacturers website