Dell have been producing their own toner cartridges for many years and the 593-BBCX is one of their best efforts to date. This original MPJ42  magenta toner cartridge is only compatible with the Dell C5765dn, so be sure you are ordering the correct cartridge for your machine.The genuine Dell 593-BBCX offers users an estimated 12,000 prints before it needs replacing. The estimated page yield of the MPJ42 has been calculated by Dell based on an average page coverage of 5% magenta toner powder.