When you refill a LEXMARK 80C0H40 (#800H4), 80C0S40 (#800S4), 80C0X40 (#800X4), 80C10Y0 (#801Y), 80C1HY0 (#801HY), 80C1SY0 (#801SY) or 80C1XY0 (#801XY) cartridge, you must replace the chip. This chip is already included with our refill kit. This chip will run for 2000 pages at 5% coverage.