Package Contains (Compatible) : 4 Pack of compatible ink cartridges replacement for HP 970 970XL 971XL ink cartridges. (1 x Black 970XL, 1 x Cyan 970XL, 1 x Magenta 970XL, 1 x Yellow 970XL) Printer Compatibility : for HP Officejet Pro X451DN for HP Officejet Pro X451DW for HP Officejet Pro X476DN for HP Officejet Pro X476DW for HP Officejet Pro X551DW for HP Officejet Pro X576DW WhyChoose Us : ? High Page Yield: 970 970XL 971XL (Black) is 9200 pages per cartridge. 970 970XL 971XL (Cyan/Magenta/Yellow) is 6600 pages per cartridge. (at 5% coverage ) ? Easy to Install: 1. Remove the PULL tape 2.Install into the printer Do not touch the chip during installation. ? High Performance: Premium Quality Ink delivers high-quality Vivid Color and sharp text, high Performance Results. ? High Quality Control: 100% printer test for each ink cartridge to ensure fullworking condition and a superior print quality. ? 100% Compatibility: Adopting the lastest smart chips. Shows accurate ink level. Printer Recognition without problems. ? Excellent Price: Competitive price, Environment friendly, Less waste. ? Firm Packaging? Packaging Protection keeps products away from possibility ofdamage during transportation and ensure your product arrive safely. ?Tips: 1. Please clean the printing head before printing. 2. If the cartridges do not be recognized by your printer: (1) Please remove the cartridges and turn off your printer. Wait about 30 seconds and turn your printer back on. (2) Re-install the cartridges again and make sure all cartridges are individually well locked in.