2 years & up. Discover the Better Builder® Set! With super strong magnetic force, unique rod and ball configurations and myriad design possibilities, Better Builders® are a wonderfully inventive way to help children discover principles of science, construction, and engineering while developing their creativity skills. Includes handy storage bin and deluxe 22-page Activity Guide which explores magnet science and provides sample building models for all ages. Magnets are safely and securely embedded in the over sized rods. Metal balls ensure a quick and strong connection. 100 piece set.