A whole new way to play your Boomwhackers Tuned Percussion Tubes - like a xylophone!Used as a carrier; it holds 8 Boomwhackers Musical Tubes, a pair of Boomwhacker Whacker? 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.*Tubes, mallets and songbook sold separately.