This replacement 641A (C9720A) Black toner cartridge is guaranteed to perform with your HP laser printer and does not void the warranty. Compatible toner cartridges (aka generic) are manufactured brand new using 100% new components. They are specially engineered to meet the highest standards of quality, reliablility, and exceptional yields that meet or exceed OEM standards. Here, at Houseofinks.com, our large selection of HP ink and toner cartridges are guaranteed to work just as good as their OEM replacements, for only a fraction of the cost! We also offer FREE SHIPPING OVER $40 on every order that ships within the contiguous US and have a 1 year return policy! We want YOU to save money and feel confident every time you purchase from Houseofinks.com!