Evans clear G1 series features a single ply of 10mil film blending bright tone, sustain, sensitivity, and durability. The G1 head sets the standard for an open and expressive sound. Tuned low, it produces a cavernous rumble that emphasizes the natural sound of the shell. 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. For over 60 years, Evans has been an innovator in drumhead manufacturing and design. As the creator of the first synthetic drumhead and other revolutionary products such as EMAD, Hydraulics, and the UV1 series, Evans drumheads are designed with the intent of solving problems for drummers. Regarded for high quality and consistency all Evans drumheads are made in the USA and feature Level 360 Technology., 18" drum head made using a single ply of 10 mil film, A single ply offers an open and expressive sound, Very versatile head for all music genre applications, a true working drummer's choice, Also available in a coated version, Exclusive Level 360 Technology collar design ensures proper contact between drum head and drum shell