Milos have magnets on the back so that they can be mounted in a range of locations, including to the Milo clips.
Avoid placing any media that contains magnets or is sensitive to magnetism, such as credit cards, bank cards, hotel card keys, or magnetic memory devices near Milo. Media containing magnetically sensitive devices should be kept 10 cm (4 inches) away from Milo. Magnetically sensitive devices such as mechanical watches and measuring devices can be affected or damaged by Milo.