The transfer belt in your printer picks up toner from the cartridge & passes it across to the page surface for crisp text & graphics. Over time, wear & tear reduces the performance of the transfer belt, so Oki recommend replacing the transfer belt at regular intervals to ensure top performance & optimal print quality. This belt unit has a page yield of up to 60000. Replacement transfer belt for Oki printers Print yield: 60000 pages For use with C532 & MC573 printers Original Oki product