Green Toner Supply&trade; Remanufactured Ink Cartridge Replacement for HP 21 (Black, 3-Pack) Green Toner Supply offers LIFETIME WARRANTY against manufacture defects Green Toner Supply offers 2 Years Money Back Guarantee on Manufacture Defects Print Yield: Up to 190 Pages at 5% Coverage Green Toner Supply Remanufactured Ink Cartridge Replacement for HP21 works with the following machines: HP Deskjet D1330 Printer, HP Deskjet D1341 Printer, HP Deskjet D1455 Printer, HP Deskjet D1445 Printer, HP Deskjet D1420 Printer, HP Deskjet D1430 Printer, HP Green Toner Supply cartridges were professionally manufactured in an ISO 9002 factory