Product Information: EVANS MX2 Black Marching bass drumheads produce a bright, focused, and full tone. The MX series contains 2-plies of 7.5mil film and a unique tone damping system that can be manipulated by applying the included felt arcs to enhance articulation and focus low end for both indoor and outdoor marching. Product Features: 32" drum head with two plies of 7.5mil film Bright tone and pronounced attack Unique modular foam arc dampening system is easily manipulated All Evans drum heads are designed, engineered and manufactured in the USA For more information and specifications, please refer to the manufacturers website