You are browsing through zazzle's challenges magnets section where you can find several shapes and sizes of challenges refrigerator magnets available for customization or ready to buy as is. A couple of the popular sizes available are the 3 inch round magnet and the 2 inch square refrigerator magnet. There is no minimum order size and many magnet designs can be customized with your own designs, photos, and text. To see some of the other products available on zazzle.com, check out our main challenges page. Most magnet orders ship in 24 hours.