Designed by Canon engineers and manufactured in Canon facilities, Genuine supplies are developed using precise specifications, so you can be confident that your Canon device will produce high-quality results consistently. The Single-Cartridge System combines the toner and drum into the same unit, which means you only have one consumable to replace. The LBP312dn uses Canon Genuine Toner, Cartridge 041 Black Standard (yields 10,000 sheets, iso/iec standard)