The whole process of making the magnets and testing there strenght.but will i be able to walk upside down? What i love about this is had i not been so tight i would have bought some stronger factory made magnets and missed all the fun of stripping down the mircowaves , so what i'm saying is its good to be tight with your money. Theres more DIY X-MEN to come next thursday so subscribe you won't want to miss it. You can see me learn to walk upside down here http://youtu.be/wr-7zcUuS90 And see