Genera G1 Coated Drum Heads. The G1 Coated is a standard for coated drumheads! The G1 Coated is a single-ply, 10mil-thick head with a bright attack, warm sustain, and a broad tuning range. The coating adds additional warmth, focus, and depth.Get the G1 for a solid head you can count on to anchor your sound. The Pack includes one of each 10", 12", and 16" tom heads.