Boomwhackers Bass Chromatics Set combines with the Bass Diatonic Set to create a low chromatic scale, or combines nicely with the BWCG Chromatic Set for an extended range of pentatonic notes. Found in most elementary music classrooms and music therapy programs around the world, these affordable, color-coded, tuned percussion tubes provide an opportunity for any age and ability to experience success making music. With no limit to the creative learning process, students can feel the joy of learning and experiencing rhythm, pitch and movement while having fun! This set consist of the 5 bass Chromatic notes in a scale (the black keys on a piano) and combines with our Bass Diatonic Set to form a full chromatic octave of 13 notes one octave lower than the diatonic sets. C#,D#,F#,G#,A# Tube length: 27" to 47".