Evans 22" E-Mad Resonant Bass Drum Head, Black, BD22REMAD, With
accentuated low-end response, the EMAD Resonant is constructed
using a 7.5mil black film with a 6.5mil fixed internal control
ring. It comes with an Externally Mounted Adjustable Damping
system installed around the 4" offset microphone port that allows
the user to manipulate attack,tone, and sustain without the need
for internal damping.