Read more This pen is fun to assemble and play around with. The magnets are pretty strong and one piece can pull or push rest of the unit, that strong. The supplied steel balls, of different size, can be used as joins or hinges. The magnetic pen has 14 magnetic rings and 30 steel balls, which can be combined at will like a building block toy. It can also relieve anxiety by changing the shape of the magnetic pen when you are in a bad mood and anxious and hyperactive. Why choose us？ Our magnetic pens contains more accessories, which can better play your imagination Made with high -quality materials, it is shiny and stronger, not easy to break The magnets are really strong，and with a nice gift boxed