Drum head with a thin layer of oil between two plies of clear film to suppress unwanted overtonesTwo plies offer consistency and durability for longer playing timeA fat, deep and short sound pioneered by early 70's rock and rollAlso available in blue and black versionsThe only oil-filled drum head on the marketAll Evans drum heads are designed, engineered and manufactured in the USA
Evans Glass (clear) Hydraulic two-ply bass 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 players with little tuning experience. Available in 3 colors: glass, black and blue.