In order to make sure that I was working with an efficient cartridge, all I needed to do was to for the Lexmark C930H2KG OEM Black Toner Cartridge, High Yield. This is because I have worked using it before and I did not have any challenges or problem s during my time with it. If anything, I was able to significantly cut down on costs which I would normally incur during the time that I would be printing large number of pages. To the present time, I am still impressed by how well it works and the fact that it was away more affordable than most others in the market.