Genuine OEM Samsung ML-2855 ND Toners
The MLT-D209L high-yield cartridge prints more rated pages than MLT-D209S for the ML-2855ND. Both are black toner for this printer; the difference is capacity. The L option gives you longer between changes, which is useful when you go through toner quickly.
Toner Buzz carries genuine Samsung MLT-D209S and MLT-D209L cartridges individually. Go with D209L if you print frequently and want more pages from one cartridge, or D209S if the lower-capacity option suits your printing. Check the final letter when ordering to choose the capacity you intend.