The perfect addition to the Imagineering Blocks to create crawl through challenges, shelves inside, and add blocks and wheels. We advise this product is sited on a level surface which provides some form of protection such as grass, gym mats or play bark chips. To meet safety standards, we advise you have 150cm falling space on all sides. Supervision recommended. Designs vary.Recommended for age 3 years +Largest cube measures: 770mm(Square)Smallest cube Measures: 660mm(Square) .