Performance Plus GG577 Black High Yield Compatible Toner for the Dell 5100cn Replacement cartridge for Dell GG577 Compatible with Dell printer 5100cn Performance Plus+ replacement laser cartridges are carefully color-matched to the original manufacturer's color, you can replace just one cartridge with a Performance Plus+ laser cartridge without fear of 'color shifting' with the remaining cartridges All cartridges pass through extensive quality control testing prior to leaving the factory 1 year warranty