Evans EMAD series features a single ply of 10mil 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. The Onyx version is the perfect aesthetic and sonic compliment to the Onyx tom heads and Onyx bass resonant. Features Made using a single ply of 10mil film The EMAD Onyx is the perfect aesthetic and sonic compliment to the Onyx tom heads and Onyx bass resonant 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: Frosted Ply: 1 Thickness: 10mil Technology: EMAD