With the Epson 266-267 cartridges, you can provide your Epson WorkForce printer with new ink. If your WorkForce printer that supports these cartridges, you can find it in the descriptions of the cartridges. It clearly states which printers the Epson 266-267 line is suitable for. You can choose the Epson brand or the private label brand Pixeljet. You can buy the colors in a combo pack and the black cartridges separately. This is especially useful when you mainly use the black ink.