Product Information: EVANS Clear Genera Resonant drumheads produce a full, round sustain with strong upper-mids that increase projection without sacrificing sustain. These 10mil single ply drumheads are ideal for enhancing tone when combined with a 2-ply batter head. EVANS Level 360 Technology is incorporated for ease of tuning, extended pitch range, and optimum quality of sound. Product Features: 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 EVANS Level 360 Technology collar design ensures proper contact between drumhead and drum shell For more information and specifications, please refer to the manufacturers website