" (1) WHY CHOOSE US? Clorisun is focus on providing you with high-value products--Ink Cartridge, Toner Cartridge. All products reanufactured with ISO9001 & ISO14001 certified,are strictly tested to perform superb result before delivery. We care about the needs of our customers and provide the highest quality products for your perfect printing experience. (2) Use for Printers: Officejet 6812, 6815 Officejet 6820, 6825 Officejet Pro 6830 Officejet Pro 6835 Officejet Pro 6230 (3) PACKAGE INCLUDE: 2 Pack 934XL Black Ink Cartridge 2 Pack 935XL Cyan Ink Cartridge 2 Pack 935XL Magenta Ink Cartridge 2 Pack 935XL Yellow Ink Cartridge (4) High Print Yield: 1000 pages per Black,825 pages per color at 5% coverage page (5) 8 necessary tips for you? 1.Please avoid touching the chips. 2.Before placing an order, please be sure to confirm your printer model. 3.If the inks do not recognize your print at the first time ,please take them off and install again. 4.Better not upgrade your printer, avoid future potential original compatible issue. 5.Please try to run the printhead cleaning when first installing the new ink cartridges to get a better result. 6.Please turn on the power once a week to prevent the print head from becoming clogged if you do not use the printer regularly. 7.Please wear gloves to prevent from getting ink on your hand. 8.While you meet any installing problems, you can freely consult us or return the goods , we will refund you.