Fargo 84912 YMCKK ribbons consist of yellow (Y), magenta (M) and cyan (C) panels for printing a full spectrum of colors by combining the colors using varying degrees of heat. The two K panels are black resin, typically used for printing text and barcodes. 
Fargo 84912 YMCKK ribbons are for dual-sided printing , with YMC and the first K panel printing on the front side, the second K panel prints on the back side of the card.
The Fargo 84912 ribbon is specially-formulated to help your printer function properly. Fargo 84912 ribbon must be used in conjunction with Fargo HDP film for your specific printer model.