The panasonic ug 3350 toner cartridge ensures your fax printer will continue to deliver optimal performance and operate at ideal levels throughout its lifespan compatible with the uf 585 and uf 595 laser fax series this cartridge boasts a printhead duty cycle of up to 7 500 pages using high end panasonic consumables and supplies provides sharp high quality output every time the panasonic printers and fax machines have been engineered to work together with their custom designed consumables