Boomwhackers are pitched percussion plastic tubes which means each tube is a musical note and you strike them to produce a sound.

Students usually hold one or two at a time (one per hand) striking the floor, the edge of a table or chair, a wooden baton (in this case one hand holds a Boomwhacker, one holds a baton) or their thigh or hand.

The cost works out to about $4 per instrument including shipping. They are sold in packs of 6, 8, or more. Some sets include "octavator caps" which put the pitch of the instrument down one musical octave.

Order Boomwhackers directly from manufacturer here or via Amazon.