Save on your printing costs with the For Dummies - Remanufactured 21/22 Black and Tri-Color Combo Inkjet Cartridge. These remanufactured inkjet cartridges have been tested to meet quality standards and provide clear prints every time. Made by recycling OEM cartridges, these inkjet cartridges for dummies are safe for the environment. You can keep away huge amounts of plastic from your landfills every year. Their damaged or worn parts are replaced, and they are refilled with OEM ink. These easy-to-use cartridges have a shelf life of 12-18 months.