Evans 14" Strata 700 concert snare drum head features a single ply of 7.5mil film with a coating that closely resembles traditional calf skin. The Strata 700 offers balanced sustain with mid-range overtones. A 2mil internal overtone control ring caters to both professionals and students with its tuning ease, increased focus and articulation. Evans Level 360 technology is incorporated to extend the level playing surface of the drumhead, 360 degrees around the drum. The vertically enhanced collar design guarantees even contact with the critical bearing edge of the drum shell, resulting in: ease of tuning, extended pitch range and optimum quality of sound. Evans Level 360 technology resolves the age-old dilemma of traditional synthetic heads consistently not fitting the drum shell without using considerable force.