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From the Manufacturer Evans 12" glass (clear) Hydraulic two-ply drum head features a thin film of oil between the plies that suppresses unwanted overtones. A classic sound, short in sustain. Tension it tight for a real thump or loose for a more slappy sound.Evans Hydraulic series features two plies of thin film offering maximum durability, a fat, deep and short sound pioneered by early 70's rock and roll. Hydraulics are famously easy to tune...making them a perfect fix for troublesome drums and younger players looking for instant sound.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.