The 10-mil, 1 ply Evans EMAD Clear Bass Drum Head comes with two dampening rings, each of which affects the head's sound and pedal response. This external system not only maximizes natural attack characteristics and offers tremendous dynamic range (even at low dynamic levels where other damping systems fall short), it also allows quick, easy adjustments, without having to remove the head from the drum. This unique feature is extremely valuable, especially during recording sessions.