The Tube Holder provides a different way to play our Boomwhackers Tuned Percussion Tubes..like a xylophone. Used as a carrier; it holds 8 Boomwhackers Musical Tubes, a pair of Boomwhacker Whacker(TM) Mallets, and a Whack-a-Doodle-Doo! Songbook. Two or more can be combined end to end for a wider range of play. Made of cotton, elastic, and hook-and-loop fasteners.