HP C4912A / Magenta

Quick overview from the supplier:

HP 82 (C4912A) Magenta Ink Cartridge for HP Designjet 820 MFP, HP Designjet 500 Plus, HP Designjet 500ps Plus, HP Designjet 500ps Plus, HP Designjet 510, HP Designjet 510ps, HP Designjet 800, 1750p.