Each shelf can hold 3 storage boxes, that come in 3 colours red, green, and yellow. Our plastic storage boxes are removable, so it makes playtime and cleaning up time quick and easy. The storage boxes can be displayed on an angle so that contents are well displayed and highly visible for easy retrieval. Alternatively, you can store the boxes flat, so all the little bits and pieces get hidden away neatly. Made from durable plastics that are non-toxic to make them sturdy, stable, and long lasting. Also, for additional safety, all the corners have smooth edges - so no worries of your children bumping themselves on anything sharp. There are also hand holes either side of the unit, so it is easier to lift and move from room to room.