Made specifically for Fargo C50 printers, the Fargo 45102 K Printer Ribbon is necessary for printing your dual-sided ID cards on a single-sided printer. Simply print the solid black side using this ribbon, and then trade it out for a YMCKO ribbon to print the full-color reverse side. Need more info or need some technical help? Contact one of our IDville tech specialists at 1.866.438.4553 today! This product is outsourced, therefore it is not available for same day shipping.