Evans MX1 black marching bass drum heads produces a bright focused and full tone with a single ply of 10mil film. The MX series includes a unique tone damping system that can be manipulated by applying individual felt arcs (included) to enhance articulation and focus low-end for both indoor and outdoor marching. Evans MX Marching Bass series includes a unique tone damping system that can be manipulated by applying individual felt arcs (included) to enhance articulation and focus low-end for both indoor and outdoor marching. 20 drum head with a single ply of 10mil film Bright and full tone Unique modular foam arc dampening system is easily manipulated Also available in a white version All Evans drum heads are designed engineered and manufactured in the USA