This 145-piece marble run set is designed to combine creative building with fast-paced racing fun for kids ages 3 and up. It includes 100 plastic blocks, 40 glass marbles, and 5 glow-in-the-dark marbles for a variety of track designs and play styles. The interlocking construction helps children develop spatial awareness, problem-solving skills, and hand-eye coordination while they build. Its kid-friendly design features easy-to-connect pieces that stay securely in place for confident play.