Evans Resonant Glass series features a single ply of 7.5mil film that responds quickly and projects well. With increased sensitivity and enhanced projection, the Evans Resonant Glass drum head is optimal for live performances. Along with the Resonant Black series, they are the thinnest resonant heads in the Evans line. 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.