Kick drum.

The Bass or kick drum, is usually the largest drum in the set with sizes usually in the range 18"-24" however drums much larger than this are available. It sits on the floor with the heads in a vertical plane, construction is the same as tom toms, and it may be viewed (particularly in jazz) as another tom tom, left untreated and tuned to a highly resonant pitch. Generally, though for most drummers' applications the drum is tuned to just above its lowest tuning point. The front head has a small (< 6") hole in the resonant head to facilitate mic'ing and the insertion or adjustment of some form of treatment to reduce resonance and increase attack. The bass drum is played by a foot pedal with a beater generally striking the centre of the head. It is common to see an additional patch attached to the batter head at the point of impact to counter the effect of constant striking in the one place. Bob Gatzen in his excellent tuning video points out that the constant impact in the same area causes a build-up of heat at this point and a head without a patch of this nature will have a significantly decreased lifespan.