Card/Postcard UV Coated (1S) with Magnet - 3.5 x 8.5. UV-Coated post card is perfect for calendars, schedules or any type of chart for a highly visible direct mail (or bulk mail) piece on a tight budget. UV Coated postcard is an effective marketing tool used to communicate your message to prospective and current customers. This postcard is UV Coated on 1 side. One 1"x2"" 12 mil. magnet is attached to the back side and is mailable. Square corners only.