... leak and print spot 4. fill ink convenient Refill cartridgeThe new model refill cartridge with chip, easy to refill inks, protect environment ... the cartridge aging. 2.Add two unilateralism valve on the base of primary struction, make sure not to leak ink, print ... use for many model printer, such as R270, R290,T50, T1100, T10, C79, C91 etc. high quality refill cartridge for new model printer