Evans Tri-Center Bongo Drum Head Pack, 7 1/4 and 8 5/8 Inch 8 5/8" drum head with a ply of 10mil film, a ply of 14mil film and a 2.25" patch between Bright, penetrating slap tone with a full, round low-end Etched texture simulates the feel of animal skin while avoiding the problems associated with natural skin heads Tri-Center minimizes overtones and adds weight to the center to enhance the fundamental tone All Evans drum heads are designed, engineered and manufactured in the USA