3D Magnetic Blocks sets contain magnetic shapes that will challenge the user to make hundreds of different constructions. Illustrated work cards are included in every set, but children will let their imagination run wild and invent their own shapes. Each cube block measures 5cm cubed so that children can also use them to measure objects or distances. Yellow blocks attracts blue blocks and like colors repel. This simple color coding makes for easy model building and teaches magnetic principles. The easy to use, freely rotating wheels add the dimension of movement to bring shapes to life. Children will spend hours experimenting and making anything you can imagine.