DynaMagz114 containing 66 magnetized rods at 2.3" length and 48 steel balls at 0.5" diameter offered by MAGZ Dyna114 is a great educational building set to entertain children as well as adults. It contains magnetized plastic rods and shiny steel balls. Have timeless fun and build whatever you imagine and visualize. One may call it a Geometry kit that can be used for Chemistry as well. This is a perfect tool for family fun. The rods are 2.3" long and the balls are 0.5" in diameter.