Laser/Inkjet White Post Cards Cards,  4" x 6", 2/Sheet, 100/Bx - SKU: MML-8575 - Customize your cards with images, design elements and formatted text. Print front and back sides, landscape or portrait orientation! These utilize standard US post card postage rates. Premium quality card stock features micro-perforations for clean separation. Printable in both laser and ink jet printers. 50 sheets per box.