The Boomwhackers BW-JG Set consists of seven color-coded tubes whose notes form a diatonic Bass set. To develop their sound, the Boomwhackers can be struck on various surfaces or even on the body, as befits their name. The notes C, D, E, F, G, A, and B are available. Ideal to expand an existing range of Boomwhackers and low tones. Together with the separately available BW-DG Set, for example, these tubes form two full, diatonic octaves.