12 months & up. The Stretch Tubes & Connectors Set is the ideal early STEM toy! This assortment of connectors and stretchy flexible tubes easily snap together, or into the holes on the connectors vertically, horizontally, or any angle imaginable, to create fantastic creations. Children will feel a real sense of accomplishment as they discover how to fit the tubes into the holes, or snap them together. Made of durable, safe plastic; stretch tubes and connectors come in a plastic stackable bin with locking lid. Set includes 40 tubes, 10 cube connectors and 10 round connectors. Tubes measure 5" x 1".