Boomophone XTS Whack Pack Play your Boomwhackers like a xylophone! The XTS Whack Pack includes: 8-Tube Boomwhackers® C Major Diatonic Scale Set, XyloToteTM Tube Holder, Boomwhacker WhackerTM Mallets, Whack-a-Doodle Doo! Songbook, OctavatorTM Tube Cap