Make sure your printer delivers professional quality prints and copies in monochrome by using the reliable black Canon 737BK genuine toner. The Canon 737BK original black toner is durable and lasts for approximately 2,400 pages before needing replacement. Thanks to the formulation of this genuine Canon 737 black toner, documents come out dark and sharp. The Canon 737-BK laser printer cartridge can also be used for producing graphics with high gradation levels.