This replacement 1720 (310-8710) Drum unit is guaranteed to perform with your Dell laser printer. This is an alternative to a genuine Dell 1720 (310-8710) Drum unit. The use of remanufactured or compatible replacement laser toner cartridges and supplies does not void your printer's warranty. We offer a 100% quality satisfaction guarantee on all of our items! Here at HouseofToners.com our large selection of Dell 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 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 HouseofToners.com!