EVANS red Hydraulic coated drumheads features a thin film of oil between two plies of 7mil film offering maximum durability, and a fat, deep and short sound pioneered by early 70's rock and roll. With the addition of a clear version of our patented UV-cured coating, this snare batter provides unmatched durability and consistency of texture. Hydraulics are famously easy to tune, making them a perfect fix for troublesome drums and players with little tuning experience.