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 ... chips.2. After installing this chip,user is able to use third party ink freely ,and save printing cost3, Use as OEM ink cartridge chip