The genuine Canon 040 black toner cartridge offers just over half as many pages as its higher capacity counterpart, but still offers a reasonable amount of pages. With sufficient toner to print an estimate 6,300 pages, the original Canon 040BK is a great way of running compatible printers (like the i-SENSYS LBP-712Cx).Canons reputation of producing fantastic quality original products is well deserved and the 040BK continues this fine tradition. The black toner powder contained within the Canon 040 toner cartridge is expertly fused to paper by your printer and creates wonderful results, regardless of what you are printing.