Play a unique pentatonic scale with these five tubes or create a full chromatic octave by adding Boomwhackers 8-note C Major Diatonic Set (203640 - sold separately). This 5-Note Chromatics Set includes C#, D#, F#, G#, and A# within the standard octave of Boomwhackers®. Tubes range in length from 33cm (13") to 58cm (23"). With no limit to the creative learning process, students can feel the joy of learning and experiencing rhythm, pitch, and movement while having fun!