“YMCKT” is a standard ribbon format: Yellow, Magenta, Cyan, K (black) + T (clear top/coating overlay).
“250 images” means the ribbon is rated to print ~250 full-color cards before replacement.
This ribbon type is good when you need to print full-color graphics and optionally black text or barcodes, and then protect it with a clear overcoat.
Entrust / Datacard list a “Color Ribbon Kit, YMCKT (yield 250)” in their product catalog.
