4 years & up. Create a limitless world of people, animals, architecture, robots, vehicles and more! This set is comprised of 12 unique plastic shapes and features six colors. IO Blocks connect with secure, yet easily adjustable friction fit and features a beautiful matte finish. The high-quality design of IO Blocks offers open-ended building possibilities and problem solving, puzzle-like qualities. Great for Parents and Educators interested in STEM skill development. Free IO App available from the APP store from your smartphone or tablet! 500 piece set.