Pair of split bamboo percussion sticks, 24" and 20", each with a tuning hole. Natural cracks will develop in the bamboo. This only adds to the awesome buzzing sound. The bamboo makes a buzzing when the split ends are bounced off the palm or knee. The buzz is due to the crack that goes most of the way down the instrument. A small hole near the bottom is covered and uncovered by the thumb to produce a wah-wah effect.