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From the Manufacturer Evans 22" frosted EQ4 single-ply bass head contains an internal overtone control ring with a removable muffle ring for optimal slap without sacrificing bottom end.Evans EQ4 series features a special, single ply of 10mil film that provides durability and a woody attack that speaks live and in the studio.. The fixed internal ring is proportional to the head size, optimizing control from 18" to 26".For over 40 years, Evans has been a pioneer of drum head manufacturing and design. Known for innovative designs such as EMAD, EC2S, and the Hydraulic series, Evans drum heads are made in the USA in a state of the art manufacturing facility. Acquired in 1996 by D’Addario and Company, the global leader in musical instrument accessories, the Evans brand is synonymous with quality and consistency.