Science materials are within reach with our mobile cart. It is low enough to allow children to explore science materials on their own. The top shelf has 4 lift-out deep display boxes with clear acrylic tops that are perfect for fragile nature materials to be easily seen; these boxes are 10" W. x 15" L. x 8 1/2" D. The bottom storage shelf has a deep lip so supplies are always contained. Constructed of birch plywood, includes 4 locking, easy-roll casters for easier mobility. Accessories pictured sold separately.