MegaMagz is a safe, creative and fun magnetic building system consisting of 66 magnetic bars (2.3" long) and 64 steel balls (0.5" diameter). MegaMagz teaches children the magnetic properties of attracting and repelling. It is fun and easy to play. You become an instant builder and creator. All ages over 3 years can enjoy MegaMagz. Collect more pieces and build larger. You can build towers and high rises with MegaMagz.