Evans GMAD Clear Bass Drum Head, 22 Inch 22" drum head made using a single ply of 12mil film Externally Mounted Adjustable Damping system allows the player to adjust attack and focus Ideal for heavier hitters looking for a solid sound and more life to the head but prefer the feel of a single ply A 12mil version of the original 10mil EMAD All Evans drum heads are designed, engineered and manufactured in the USA