Whilst the Epson Stylus Pro 9890 and all other compatible printers are incredibly efficient machines, sadly they still produce a fractional amount of waste ink in every print and this has to go somewhere. In steps the genuine Epson C12C890191 which prevents the waste ink from settling inside your printer, preventing the colours from reducing the quality of your prints. Maintenance items for laser printers tend to have a very long shelf life and the C12C890191 is no exception. You can expect to get an impressive amount of prints from the humbly priced C12C890191, which is a small price to pay for maintaining Epson`s incredible print quality.