5 years & up. Imagine, build, create! The Plus Plus Baseplate Duo makes the perfect foundation to unleash your creative ideas. Build a scene, make a spinning top, and more with this durable platform. Connect the pieces together to construct a multi-story structure. Compatible with all regular-size Plus Plus pieces. Each baseplate measures 4.5" x 4.5". Plus Plus pieces sold separately. Included: 2 Plus Plus Baseplates.