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 13-page Activity Guide which explores magnet science and provides sample building models for all ages. Magnets are safely and securely embedded in the oversized rods. Metal balls ensure a quick and strong connection. Tested to ages 18 months plus. An Oppenheim Platinum Best Toy Award Winner. For ages 2 .