This kind of plastic magnetic hooks composed plastic house and disc neodymium magnets. The magnetic force only comes from the disc magnet. The magnetic strength is not too strong. The magnetic hooks can only be used on a vertical surface to hang light things.It is normal attracted on the door to hang hat and coat, that's why it also called as magnetic coat hooks or magnetic hat hooks.
Besides of the magnets used for magnetic hooks, the hanging ability also depends on the material of the surface where the magnetic hooks attracted onto,also depends very much on the friction of the two surface. So that, it difficult to predict the magnetic force on any magnetic hooks.We just provide some reference holding force value.