This clear sturdy 9"D acrylic tub is perfect for teaching concepts such as floating and sinking. Bottom drain plug makes cleanup a snap; Cover includes a plastic building block surface, allowing for use as a play table; Baltic birch frame fits easily through classroom doors; Locking casters; Measures 20-1/2"L x 20-1/2"W x 24-1/2"H; Ships ready to assemble; Lifetime limited warranty; sand kinetic sand sensory table sand colored sand moon sand Sand sensory toy play sand sensory sand outside play sand kinetic sand sensory table sand colored sand moon sand Sand sensory toy play sand sensory sand outside play