Develop critical thinking, challenging young minds while making learning fun and engaging. Includes double-sided challenge cards, and storage box. 20 yellow bases, 20 blue bases, 120 grey rod #1, 40 grey rod #2, 40 6-point connectors, 16 strings, and 8 arch connectors. Ages 5+. WARNING: Choking Hazard. Assorted colours. 305 pieces per set.