EVANS Resonant Black series features a single ply of 7.5mil film without control rings, vents, or a mic port. It also offers a wide-open tone with maximum sustain with a classic black aesthetic. Made with a single ply of 7.5mil film Single ply of film without control rings or vents in order to maximize resonance Provides optimal resonance at higher tunings. Ideal for jazz and bop EVANS drumheads are designed, engineered, and manufactured in the USA.