The Boomwhackers Boomwhackers BW-CG Set is a five piece chromatic supplementary set for the diatonic boomwhacker sets. According to their note values, the color of the tubes was also chosen, this visual connection helps in teaching and learning notes. The five colorful plastic tubes, one C#, D#, F#, G# and A# tube each, turn a diatonic boomwhacker set into a full-fledged instrument. Suitable for example for the Boomwhacker BW-DG set.