Something is strange about that - they say the same model head is compatible with both the x900 printers and the 3890 printer, which latter is part of the 3800/3880 family. As far as I'm aware, the print head for an x900 is a different design than the one for the 3800/3880 family. I suggest you seek some clarification. Also they don't say whether the head is an OEM product, whereas for some of the Epson heads on their site they do. Great care needed I think. I don't know whether any third-party can manufacture an Epson head, or if they can, how they would perform - but the notations on that website just raise those kind of questions.