3 years & up. These versatile, easy-fit tubes are the perfect hands-on manipulative for endless creative exploration! Use them independently or elevate playtime by incorporating them into a light table, sand, or water play for a dynamic sensory experience. Simply add a child's imagination, and watch as curiosity leads to exciting discoveries! Designed for durability and easy organization, this 80-piece set comes neatly stored in a sturdy, stackable container measuring 12"L x 7"W x 6"H�making cleanup and storage a breeze.