Large Square blocks joined with circular connectors. Winner of the Parents' Choice Award, 2010, Recommended and Dr. Toy's Best Green Product Award, 2011. The Rubbabu Rubbablox Building Blocks is a 6-piece beginner block set made of sustainable, eco-friendly, natural rubber foam materials. Babies can grasp, push, and move these blocks to build simple structures. The connector blocks fit snugly into depressions in the blocks. Simply push the connectors in to create different shapes. This set builds creative thinking skills while providing hours of endless fun. Includes 6 large cube blocks and 7 spherical connector blocks in bright colors with tactile surfaces. For ages 12 months and older. All Rubbabu toys are made with carefully chosen ingredients that are safe for babies, toddlers, and infants. The rubber materials are 100% pure rubber from the Hevea tree while the soft surfaces are made with nylon flock from Spain. Excellent tactile sensory toy for children.