The lightweight affordable plastic tubes comes with 2 Octavator Caps that change the tone of the tube by a full octave - and a book with a CD on how to use the Boomwhackers. $10 a set - $15 for 2 sets.
A very popular set, great for all ages and abilities. No prior musical experience is necessary to enjoy playing with these color-coded tubes. The creative use of these tubes is almost limitless. When the tubes become a little out of shape, place them in a sunny area for 15-20 minutes, then reshaped them with your hands.
Put one of these caps on the end of a Boomwhacker tube and you'll lower the tone by a full octave! Place one on the higher-octave
Boomwhacker tube to create the same tones as the bass octave tubes. Place one on the bass octave tube, and the tube will be down another octave.