Original Printhead Roland DX7/VS 640 Print Hea Printer The Roland RE640 / VS640 DX7 printhead is either used in 4-colour or 8-colour printers and has a minimum, variable droplet size of 1.5 pico litre (max. droplet size is 21 pico litre)Condition: New productGenuine Printhead Roland DX7/VS 640 Print Hea PrinterThe Roland RE640 / VS640 DX7 printhead is either used in 4-colour or 8-colour printers and has a minimum, variable droplet size of 1.5 pico litre (max. droplet size is 21 pico litre). The typical firing frequency for The Roland RE640 / VS640 DX7 printhead is 8 kHz. The Roland RE640 / VS640 DX7 printhead is based upon the most recent Epson technology. This is the original Roland printhead (part numbe).