Epson DuraBrite 127xl Extra Yield Combo Pack, Black (2 ink cartridges in this box) Sold as 2/PK. DURABriteTM Ultra inks offer smudge-, water- and fade-resistance for superior image quality and durable prints. Ideal for double-sided printing; inks will not bleed through. SmartValve Control Technology employs a pressure-activiated valve to smoothly and rapidly deliver ink to the printheads at variable rates. MicroPiezo ink level sensor accurately detects the ink level within the cartridge and automatically alerts the user when ink is low.