This is compatible ribbon for Okidata OEM part #42377801, #52102001. The page yield of this Okidata ribbon is pages based on 5% page coverage. This ribbon is made of high quality standards and is guaranteed to meet or exceed OEM specifications. Toner Booth provides 100% guarantee all of its compatible cartridges and re-manufactured cartridges. You will also receive free shipping on all US order over $50.