Evans B13G1. G1 Coated Drum Head, 13 inch. Evans G1 Coated drumheads feature a single ply of 10mil film that blends bright tone, sustain, sensitivity, and durability. This drumhead incorporates Evans Level 360 Technology for ease of tuning, extended pitch range, and optimum quality of sound, and produces an open and expressive sound featuring a coating that delivers additional warmth, focus, and depth. Tuned low, it produces a cavernous rumble that emphasizes the natural sound of the shell.