1,compatible OEM ink cartridge 2,save printing cost 3,Easy to use 4,High ... Stylus TX420WEPSON Workforce 320EPSON Stylus NX420 For use with printer ink cartridge systemCartridge No: T1331 black, T1332 cyan, T1333 magenta, T1334 yellow ... installing this chip,user is able to use third party ink freely ,and save printing cost3, Use as OEM ink cartridge chip