You can print out invitations on any type and color of A4 paper, but we recommend ticker printing paper or photo paper. You can use one A4 sheet to print 4 invitations in the following way: When one page is printed, take the paper and turn it to the reverse side, the end of paper that was in your right hand must be shifted to your left hand and then placed into your printer - the reverse side will be printed out with your invitation. When both sides are printed out, cut your paper in 4 pieces (half-length and half-width). See you at birthday party!