This is a Uni-Kit toner refill kit for HP Printers that use the CF280X or CF280A toner cartridge). This refill kit is equivalent to the HIGH YIELD version CF280X but the CF280A can also be refilled with it. It includes the toner refill, instructions, and a new compatible replacement chip needed to reset the toner level in the printers memory. The chip is required and included with this item. Also required is the toner hole making tool, which is sold separately and is reusable.