EVANS clear Genera Resonant drum heads produce a full, round sustain with strong upper-mids that increase projection without sacrificing sustain. They are ideal for enhancing tone when combined with a 2-ply batter head. 10" resonant drum head made using a single ply of 10mil film A single ply offers an open and expressive sound Ideal for enhancing tone when combined with a 2-ply batter head Exclusive Level 360 Technology collar design ensures proper contact between drum head and drum shell