Our Preschool SCIENCE/HABITAT CENTER is perfect for early childhood environments! The perfect addition to any learning environment. Spacious 18" x 18" x 18" enclosure for a wide variety of nature observations. 5" screw-on cap for easy access. Remove top and use bottom for Sand and Water Play. Mega-tray and 2 clip-on caddies included. 3" locking casters. 21"x21"x28"