This unit helps teachers present preschoolers fun scientific lessons in a controlled, helpful manner. Featuring 4 removable observation creates with a sliding plastic cover and handles. When the science lesson is over each crate has a dedicated storage spot on top of the cart. Below there are 3 additional large storage spaces. The four attached swiveling and locking casters are reinforced for best combination of mobility and security for early learning environments. Constructed form heavy-duty Baltic Birch plywood with rounded edges and a recessed back for child safety and triple coated with our exclusive UV Tuff-Gloss™ finish making it easy to clean and resistant to stains. The Science Exploration Table's total dimensions are 23 1/2"H x 48"W x 15"D. The interior dimensions of the observation crate id 4"H x 10 3/4"W x 10 1/2"D. Delivered fully assembled straight to your door step! Proudly made in the U.S.A. with a Lifetime Manufacturer's Warranty.