DoorStepInk remanufactured in the USA HP 910 1 black and 3 color combo 4-pack are the highest quality replacement ink cartridges on the market. Using only original HP 910 (3YL61AN) black, (3YL58AN) cyan, (3YL59AN) magenta and (3YL60AN) yellow cartridges, we remanufacture each cartridge to the highest quality standards to match OEM ink level, color, and performance guaranteed!