I have a box of 100 magnets for business cards. Just the right size. I never really thought about using these to line a box or small tin (which I have several of) to make a pin catcher. I have 2 magnet pin cushions and the pins lay flat against the bottom. The magnets are mounted on the underside of the plastic surface.. A couple new thought I think I can make use of. Look what happens when you put a group of quilters together and see what light bulbs go on!