Worry-free service: Free return and exchange service. Our customer service team is available 24 hours online. Printing color effect: The product has undergone rigorous testing, and each color block shows a pure color, and there will be no reddish or blueish problems. Excellent printing effect brings us richer life colors. Compatible Model: 522 T522 ink refill Bottles for Ecotank ET-4800 ET-2720 ET-2760 ET-2803 ET-2800 ET-4700 printers. Like an OEM: 522 ink refill bottles with auto-stop design, no spillage, easy to fill, no dirty hands. Easily refill your Ecotank and Supertank printers that work just as OEM. Larger capacity ink bottle, longer life cycle:2 bottles of 70ml black 502 ink can print up to 12,000 pages, and each bottle of 70ml color 502 ink can print up to 6,000 pages (5% coverage).