Evans? EC2? series features two plies of 7mil film with optimized attack, tone, length of sustain and ease of tuning for each size head.The EC2 features a Sound Shaping Technology ring mounted underneath two plies of 7mil film. By controlling edge vibration (instead of eliminating it), the ring isolates and damps higher overtones, enhancing low-end and attack, and enabling a broader tuning range. The coated version delivers additional warmth, focus, and depth, plus a unique translucent appearance.