Yellow T1004 Ink Cartridge for Epson B40W,BX600FW,BX610FW,Stylus Office B1100,SX100 Printers. Epson's high yield indivdual ink cartridges for high print volume business users. Epson DURABrite Ultra ink no smudging, no fading, simply perfect prints whatever you're printing Epson's DURABrite tm Ultra ink has an exclusive technology where each pigment particle is coated in resin. This makes the ink water -, smudge -, and fade resistant on all paper types, for beautiful, durable results.