The DW Bass drumhead Ebony 20" is a single-ply resonant bass drumhead, suitable for any 20'' bass drum. Fitted with six 1/2'' vents, the DW Bass drum head projects its tone without reducing its low end. These vents also ensure optimal bass drum resonance. The glued-channel crimped aluminium hoop enhances vibration transfer, further enhancing the resonance and low-end tone of the bass drum.