Dyna Magz contains a unique element which is exclusive to the Magz family. The Cuball is a nickel plated steel ball which is covered in clear plastic with six die cuts. This allows for sturdy cubic structures and high rises which could not have been completed prior to the introduction of the Cuball. This set includes 15 Cuballs, 64 bars and 20 nickel plated steel balls. This is literally a ball that allows for constructing cubes. DynaMagz utilizes triangles and pyramids in its construction. The Dynamagz Cuball allows for such sturdy cubic connections that even a high rise structure can be jolted without collapsing.Ages 5 and up.By Progressive Trading