Custom Printing - Print Unique Sizes and Shapes | PrintPlace If you require folding or scoring, then you will have to select these and forego rounded corners. Q: What are the most popular sizes for custom print products? A: Customers tend to select the following measurements for the following products: 2" x 3.5" for business cards. 4" x 6" for postcards. 8.5" x 11 " for brochures.