The Printer Drum Cartridge and Transfer Roller from Dell are specifically designed to work with Dell Color Laser Printer 5110cn. The Drum Cartridge applies toner to the page whereas the transfer roller transfers the image to the paper and collects any excess toner in a waste reservoir. It offers a usable life of approximately 35,000 page impressions. The Imaging Drum and Transfer Roller work in conjunction with the four-toner cartridges Black, Cyan, Magenta and Yellow to produce impressively sharp images and text.