HP 731 DesignJet Printhead, P2V27A

The HP 731 is a universal printhead, designed by HP to handle two color channels per head.

It works specifically with HP Bright Office Inks, which helps deliver bright, accurate colors for technical prints

Built on HP Thermal Inkjet (TIJ 4.0) technology for reliable drop generation.

The head has 4,224 nozzles total — that’s 2,112 nozzles per color (since it supports 2 colors)

The drop size is 6 picoliters, which gives a good balance of detail and coverage.