EPSON T6641-T6644 70ml Printer series for use in: 
Premium EPSON L100/L110/L111/L120/130/132/200/210/220/211/222/300/301/303/310/312/313/350/351/353/355/358/360/362/363/365/366/455/456/550/551/555/558/565/655/1300    
Japan market: EW-M660FT/PX-M160T/PX-S160T/EP-M570T (KSU-BK-L,HSM-C,HSM-M,HSM-Y)                                          
North America,Europe market:   ET-2500/2550/4500/4550/3600/14000/16500    "No SERIAL with instruction"

EPSON T6641-T6644 100ml Printer series for use in: 
Premium EPSON L100/L110/L111/L120/130/132/200/210/220/211/222/300/301/303/310/312/313/350/351/353/355/358/360/362/363/365/366/455/456/550/551/555/558/565/655/1300    
Japan market: EW-M660FT/PX-M160T/PX-S160T/EP-M571T ( KSU-BK-L,HSM-C,HSM-M,M-Y)                                          
North America,Europe market:   ET-2500/2550/4500/4550/3600/14000/16500    "No SERIAL with instruction"