I made made my little bottle caps with artitude into magnets!! I glued Lee Valley rare earth magnets to the back. I always use their quarter inch magnets because they are so strong - they hold up to 10 sheets of paper to a metal surface!! I also glued large paper clips to some of them for a little added interest and fun!! These easily hold a list or photo while looking pretty on your fridge!! The large paperclips are available at Staples and possibly at your local Dollarama store!!