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. High Capacity toner options keep up with your busy printing needs, so you have less replacement efforts and more time. The Single-Cartridge System combines the toner and drum into the same unit, which means you only have one consumable to replace. The LBP312dn and MF525dw use Canon GENUINE Toner, Cartridge 041 Black (yields 10,000 sheets, ISO/IEC standard) and Cartridge 041 High Capacity Black (yields 20,000 sheets, ISO/IEC standard).