Whacky Music Complete Upper and Lower Octave Sets Boomwhackers Tuned Percussion Tubes Go to amazon.com Related posts Best percussion tubes list FeatureBass Diatonic- Diatonic tubes with octavator capsDiatonicChromaticBass chromatic- chromatic tubes with octavator caps Description4 sets bass chromatic, Chromatic, Bass diatonic and Diatonic