TOMIBOY- Bookshelf with Hidden StorageLarge 4 Shelf Montessori Bookshelf with Hidden Book Toy Storage area in back! Very strong, solid design Made from 1 2" USA Baltic Birch plywood. This product comes pre sanded. The wood is untreated and beautiful left as is, but can also be stained, painted or sealed should you chose to do so (see general information disclaimers below). Assembly required Very very easy to put together. Wood glue and or hardware included when necessary for assembly.