Black monochrome (KO) EZ-BO Cartridge with Cleaning Roller, 500 images. The ribbon is used to print black (K) text or images on the front of the card. The remaining overlay (O) provides an extra layer of protection for the card. Compatible with DTC400, DTC1000, DTC4000, C50, DTC1250e, DTC4250e. This part is also known as 045113.