The 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 player to adjust attack and focus. 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 Specifications Treatment: Clear Ply: 2 Technology: EMAD Size: 18 Watch: HEAR THE EMAD HEAVYWEIGHT SERIES