The Imperium drumhead has two layers, one of 250 microns and the other of 125 microns, with a total of 375. Each layer of the film is made with a texture that enhances midrange and low-range frequencies. They provide a well-balanced harmonic range with great sensitivity. Ideal for all types of percussion instruments. Warm and dark tone with a soft touch. Harmonic controlled sound Ideal for drumsticks, mallets and brushbrush