The Epson LX-350 (a 9-pin impact dot matrix printer) uses a fabric (cloth) ribbon cartridge specifically made for dot matrix printing. The ink is embedded in the ribbon, and printing happens as the pins strike the ribbon onto paper.
Compatible Printers
The C13S015637 ribbon fits Epson impact dot matrix printers that use the same cartridge system, including:
Epson LX-350
Epson LX-300
Epson LX-300+
Epson LX-300+II
Epson LQ-350