This heavy duty compartment box is great for any classroom, craft room or playroom. Made with premium Baltic Birch plywood (no formaldehyde - meets California guidelines). The cubbies are 3 1/8 x 3 1/8 x 2.5" deep. Sanded extremely well so there are no sharp edges. 1/2" thick plywood sides/dividers it can stand on it's side of bottom/back.