Evans ™ EC ™ snare heads feature two plies of film. The combination of a 7mil ply top and bottom and a 10mil biedt a controlled sound but with resonance and sensitivity at all tuning and dynamic ranges. Sound Shaping Technology ™ (SST ™) rings on the underside reducing unwanted frequencies and Enhances attack. The Reverse Dot lends extra durability, focus and attack in the center.