Evans EC2 Coated Fusion Tom Pack (10-12-14) EC2 heads feature an "Edge-Control" ring mounted underneath two plies of 7mil film By controlling, instead of eliminating edge vibration, the ring isolates and damps higher overtones, enhancing low-end and attack, and enabling a broader tuning range Evans broke new ground by developing the EC2 batter head, which removes unwanted overtones, focuses pitch, and enhances attack without inhibiting the dynamic range as other damped heads do Rolls around the toms spread in clean intervals; floor toms roar with presence The EC2 features an "Edge-Control" ring mounted underneath two plies of 7mil film