The Okidata Microline 690 Dot Matrix Printer offers a dynamic ink delivery system, producing printouts with a series tiny metal rods or pins striking against a ribbon gliding across the paper. Each Genuine Okidata Ribbon Cartridge has a space saving design which easily installs, to reduce downtime normally spent on complicated replacement procedures. These OEM / Genuine Okidata 44173403 Black Ribbons have the power and durability to tackle the most demanding print tasks. The Okidata Microline 690 Printer also contains a thermal ribbon, which minimizes smudging and blurring when handled. We guarantee excellent print quality with our Genuine Okidata Ribbon Cartridges or we will refund your money within 90 days of purchase. And every Okidata ribbon cartridge has up to a 2 year shelf life for definitive performance and convenience.