Evans EMAD BD18REMAD 18" Black Bass Drum Resonant HeadThe Evans EMAD Resonant 18 head comes with two interchangeable foam rings that allow the user to manipulate bass drum resonant head sound without the need for internal damping. Each ring eliminates overtones around the edge of the 5 offset microphone porthole and offers varying degrees of control over attack, sustain, pitch and feel. Specifications: Model #: BD18REMAD Sold By: Single head Diameter: 18" Series: EMAD Resonant Material: Plastic Color: Black Surface Type: Smooth Drum Head Type: Bottom (Resonant) Thickness: 7.5mm Number of Plies: 1 Collar Type: Open Channel Finish: Black Attack: Adjustable Tone: Warm Sustain: Adjustable 256591