Includes HIGH YIELD compatible cartridges for Brother LC51 (10 ink cartridges total with high yield capacity yielding the same page yield as 20 OEM cartridges): 4 Black HIGH CAPACITY LC51BK (each of our High Capacity LC51BK cartridges yield DOUBLE the OEM yield) & 2 each of the color cartridges LC51C LC51M LC51Y (our high yield color cartridges yield FOUR times the OEM yield per color!)