Product Information: EVANS EQ4 series features a single ply of 10mil film. A fixed 10 mil internal overtone control ring focuses the tonal response of the drum. The frosted surface provides a warmer tone. Product Features: Made using a single ply 10mil film Made using a blend of unique materials to produce warm, full, and rich tones; for resonant or batter use A fixed internal overtone control focuses the tonal response of the drum; for resonant or batter use Bring out the best of a vintage kit and evoke a classic appearance and sound from a modern drum All EVANS drumheads are designed, engineered, and manufactured in the USA For more information and specifications, please refer to the manufacturers website