This 145-piece marble run set includes 100 building blocks, 40 glass marbles, and 5 glow-in-the-dark marbles for exciting day and night racing fun. Designed for ages 3+, it promotes Stem learning, creativity, spatial thinking, and teamwork. Easy to assemble, safe, and perfect for solo or group play. Warning: Choking Hazard-Toy contains a marble and small parts. Not for children under 3 years.