This is a door decoration designed to be used on your cabin door during a cruise. It's designed to have a 3" (75mm) button glued to it with a photo or details of a specific cruise. (If you don't have a button press, you could also use a laminated cut-out or 3D-printed logo.) Because of the size of the piece, I designed it with a cavity to glue in the magnet from a 27 lb hook. (I had plenty of these on hand from previous cruises, which is why I used this specific magnet.)

You can find the magnets I used on Amazon here: https://www.amazon.com/gp/product/B0787Q54M1