Evans Hydraulic Glass (Clear) Bass Drum Head, 22 Inch

22" drum head with a thin layer of oil between two plies of blue film to suppress unwanted overtones. Two plies offer consistency and durability for longer playing time. A fat, deep and short sound pioneered by early 70's rock and roll. Also available in clear (also called glass) and black versions. The only oil-filled drum head on the market. All Evans drum heads are designed, engineered and manufactured in the USA.