zenidaiko; hollow bamboo baton with coins inside
A traditional Japanese folk percussion instrument: a hollow bamboo stick with coins strung inside, shaken or struck to produce rhythmic sounds.
They danced while playing the zenidaiko at the festival.
Compound of 銭 (zeni, 'coin') and 太鼓 (taiko, 'drum'), referring to the coins inside the bamboo tube that produce a drum-like sound.