Evans EMAD Onyx Bass Drum Head, 22 Inch 22" drum head made using a single ply of 10mil film Externally Mounted Adjustable Damping system allows the player to adjust attack and focus Very versatile head for all music genre applications, a true working drummer's choice The Onyx version is the perfect aesthetic and sonic compliment to the Onyx tom heads and Onyx bass resonant All Evans drum heads are designed, engineered and manufactured in the USA