Set of (2) 4mm ink dampers for a variety of epson printheads and inkjet printers. Ink damper 4mm fits inks line sizes 4mm x 3mm / 4mm x 2.8mm / 4mm x 2.5mm. Each ink damper 4mm includes rubber o'ring and copper nut. Ink dampers should be replaced every 4 - 6 months to increase printhead longevity and insure quality printing.