The nice thing about Magformers? Besides the fact that you enjoy it immensely? Well, you can all combine the Magformers shapes with each other. This is how you build beautiful and unique creations with toy magnets. In this Window Plus 20 Set, the classic Magformers magnets are combined with window shapes. This way you can effortlessly create a special effect, even with the simplest model. This 20-piece set is ideal as an introduction to Magformers educational toys. Moreover, you can permanently combine all Magformers with each other.