The toner cartridges are patented for the use in Canon i-SENSYS LBP312x.
The company stated that the release includes two cartridges, which feature yields matching the OEM of 10,000 and 20,000 pages respectively for use in Canon i-SENSYS LBP312x. The NT-PC041C replaces the OEM 041 and the NT-PC041XC replaces the OEM 041H.