Magna-Seal Postcard - Custom Size (8.51 x 5.26 to 8.5 x 10.875). MAGNETS PRICED SEPARATELY. We offer the processing of one mail ready* address list at no extra charge. Additional lists will incur added processing fees. Postage is extra. Postcards are not automation compatible mail. *See options tab for list specifications. Includes up to 30 minutes of art setup time.