Postcard Size: 4 x 6 inches (148 x 100 millimeter), paper with 108 sheets and two color inks included  Watermark reverse side; These post card sized photos are printed using dye sublimation print technology, so that means as soon as you print is finished it is instantly dry, smudge free and water resistant  Compatible with SELPHY CP910/CP820/CP1200/CP1000/ CP1300  Genuine Canon Ink produces on average 35 percent more quality prints than imitation cartridges