The Kyocera DK-7105 drum works closely with the toner in your laser printer. The drum ensures the correct build-up of the print. This part has a long life of approximately 300,000 pages, so you rarely need to replace it.
Note: this is a drum, not a toner!
A drum is not a substitute for an empty toner. Only order a drum if your laser printer indicates that the drum needs to be replaced.