Indoor Magnets 30 Mil Round Corners can be of great use for health clinics and hospitals due to their ability to work as a miniature billboard indoors. These custom rectangle and square magnets are excellent for displaying general information, instructions and also images. It is also a good idea to make these customizable magnets a complimentary gift to your users. Order today and access our free digital design assistance, free digital proofs and free full-color printing offers.