EVANS Strata 700 Concert snare drumheads feature a single ply of 7.5mil film with a coating that closely resembles traditional calfskin. The Strata 700 offers balanced sustain with mid-range overtones, plus a 2mil internal overtone control ring that caters to both professionals and students. EVANS Level 360 Technology is incorporated for ease of tuning, extended pitch range and optimum quality of sound.