The Fold and Lock 20 Tray Mobile Cubby is two cubbie units adjoined by hinges providing a secure, locking storage space! This set of cubbies is perfect for playrooms and classrooms! Mounted on rolling casters, this cubby will make clean up time a breeze. This rolling cubby is made from nine ply birch plywood with safety rounded edges and a safe water based finish, ensuring child safety. The backs of each cubby are made from screwed on hardboard.