However, no benefit for something else to those things. Ferrite cores are the. Already seems to be included in some form of iron. Magnetism none exists. Nullkommagarkeiner. Even just placed on a steel sheet, the cores
not even keep their (very small) weight there. Not even a single needle Hold.
If someone needs ammunition for a slingshot or would like to take things as economical duration Lolly, this may make sense under certain circumstances. As ferrite cores for anyway entstören not the slightest hint of an aptitude.
In my opinion, clearly stay away. Scrap.