Evans MX1 Black Marching Bass Drum Heads are top quality, versatile heads for your marching bass drum. MX1 heads feature a unique series of felt dampening arcs that can be adjusted to give you more or less overtones and resonance, as the musical situation calls for it. Evans Marching Drum Bass Heads are made from a durable, single 10-mil ply of film, which yields the clear articulation you want from your marching bass drum. These heads are proudly manufactured by Evans right here in the USA, and you can find them at the Drum Center of Portsmouth.