Magnetic Pin Backing
Most pins tend to, well, pin onto clothes or surfaces for display. Magnetic backing instead lets you keep it attached without poking holes into your clothes. Great for keeping your stuff in good condition but you're probably asking, "how does this add pop?"
Simple. Part of what makes a pin appealing is the ability to wear or display them on different surfaces. With magnetic backing, you can wear a pin not only clothes and fabric, but also for display on fridges, laptops shelves, and any magnetic metal surface.
A magnet back gives your pin designs a much bigger selection of options for display and presentation.