Genuine OEM Samsung CLP-620 nd Toners
Samsung 508L toner is rated for more pages than 508S toner in the same color. Both options are made for the CLP-620ND; the difference is how many pages each cartridge is rated to print, so the L option gives you longer between changes.
Toner Buzz carries genuine Samsung 508S and 508L cartridges in black, cyan, magenta and yellow. Choose the color you need first, then its capacity. The 508L option suits frequent printing, while 508S is the lower-capacity choice for a color you use less often.