The 731Y cartridge is a high quality yellow toner cartridge that has been produced by themselves. As a result you can expect minimum fuss and maximum compatibility when using the 731 Y laser toner cartridge in your printer. The toner powder in this 731 toner cartridge has been specially formulated to work with the i-SENSYS LBP-7100CN and all other compatible printers. No additional drum unit is required as the 6269B002 cartridge itself contains everything your printer needs to fuser the toner to paper.