ncludes the most popular Boomwhackers set- the C Major Diatonic Scale Set comprising 8 notes: C' to C'. The diatonic scale allows more songs to be played and is preferred over the pentatonic set by most music teachers tubes range in length from approx 11' to 24'. Octavator™ Tube Caps; which lower the tone of the Tubes by an octave when placed on one end. The 8 pack contains enough caps to use on any of the Boomwhackers Sets. XyloTote™ Tube Holder which can be used to play the Boomwhackers as a xylophone; or used as a convenient tote and can hold; 8 Boomwhackers Musical Tubes a pair of Boomwhacker Whacker Mallets and a Whack-a-Doodle Doo! Songbook. Made of cotton; elastic and hook-and-loop fasteners.