4 color chips combines into one chip frame and equals to the chip part of printer when it's loaded into printer. When one of ink tank is used up, just by a press on the white button to reset chip and then replace a new ink tank. (Skyhorse Code No.73C4,71C4,69C4) For use with EPSON NX215,NX115,NX100,NX415,NX105,NX515,NX100,NX400,NX300,NX300,CX6000,CX5000,WorkForce30, 40,600,CX7000F,CX8400,SX515W,SX110,SX210,SX410,S21,SX510W,SX115,SX415,BX610FW, BX300FW,S20,SX200,SX205,SX400,SX405,TX300F,T10,T11,TX100,TX210,TX213,TX410,TX200,TX209, X409,TX400,T20,TX111,TX110,T21,T40W,TX550W