Package Included: 1BK/1PBK/1C/1M/1Y 564XL ink cartridge, 1 Set for total 5pcs. 100% compatible with the following printers: HP Photosmart 5520 6520 7520 5510 6510 7510 5514 5515 7515 6515 7525 5525 Printer HP Photosmart C6380 C6350 D5460 B85500 Printer Photosmart Premium C309A C410A C310A Printer Officejet 4620 Deskjet 3520 3521 3522 Printer 1. My printer reports "The following print head has a problem" or any error message, how do we process the next step? LKB Answer: Just skip the message, and press "OK" or "Continue" and go on printing. 2. My printer did not recognize the print head, how do we do? LKB Answer: ? please take off print heads, use eraser to clean the chips softly and tissue paper to clean the metal touch pot softly(can't finger touch), and then re-install the print head; Or ?You can use a knife to tear off the remanufactured print head chip, and then use the double-side tape to paste the original chip. 3. My printer hasn't printed for a long time, now the printer report shows that the print head has a problem, how do we do? LKB Answer: Your printer at least needs to print 1~2 pages twice a week. 4. If the ink in the cartridge is dye ink, can I change the dye ink to pigment ink? LKB Answer: No, can't. Warranty Card: We will send a Warranty Card to you with shipment. We stated below on the card: ? Money Back Rule in case any defect; ? Normal Printing Problem Solution. Note: 1. Our HR564XL ink cartridge is New compatible one, not original one, High quality with good price to save more money for you; 2. When you replace the print head, please do Printer Head Cleaning 2~3 times every time. How to contact with us (2 Years Warranty): Product listing > Click Sold by Titelbaum> Choose the option Ask a question Log into Your Account > Click Your Account > Your Order > Find your order and click Contact Seller