The "kendang" is a double-headed drum of jackfruit wood and cowhide. The exterior is shaped like a truncated cone while the negative space of the interior is sculpted like an hourglass. This shape and the cinching action of hide straps creates two distinct, approximate tunings in one drum. Like most gamelan instruments, "kendang" are paired: the larger, lead part female, "wadon", and the other male, "lanang". The surfaces inside the "kendang wadon" are carved straighter than those in the "lanang", resulting in a more resonant, booming timbre.