Compatible Okidata ribbon cartridges from LD Products are guaranteed to meet or exceed the print quality of the OEM (genuine) ribbon cartridges. Purchasing our Okidata Microline 5721 compatible ribbon cartridges is an excellent way to save money without sacrificing quality. OEM ribbons are also available for your Okidata Microline 5721. Our compatible ribbon cartridges have a 'Two Year 100% Quality Satisfaction Guarantee'. The use of our compatible ribbon cartridges for the Okidata Microline 5721 does not void your printer's guarantee.