This set of 4 clear, sturdy tubes is remarkably versatile. What we love about them is that you can fill each one with assorted visual or auditory stimuli that a particular student finds reinforcing, completely individualizing them. Each tube features dual openings with 2 solid lids along with four vented lids that let children explore their sense of smell or even observe little critters. The lids easily twist off and on, and the solid lids hold liquid securely inside.
The tubes measure 12"H x 2.5" in diameter.