Bonham DRUMHEADS 22 inch EXD External Damping 2 ply Bass Drum Batter Head. features midrange tones with low-end and increased durability. Constructed with 2-ply of 7-mil film and these drumheads have an overtone reducing agent applied between the 2 plies providing overtone control with increased attack. External Damping system containing a foam muffle ring that can be removed if required depending on the sound requirements of the sound and mix required Bonham DRUMHEADS are a UK brand that are committed to supplying quality drum heads for the every day drummer for an affordable price. please look at my other listing's for other Bonham drumheads.