The HP 727 Gray (part number F9J80A) is a high‑capacity 300 ml dye‑based ink cartridge specifically designed for HP DesignJet large-format printers. Its gray shade enables the printing of true neutral tones, which is especially useful in architectural drawings, renderings, and technical designs.  The ink drop size is 6 picolitres, helping to deliver smooth gradients and precise detail. The cartridge is made to withstand working conditions between 5°C and 40°C, with a relative humidity range of 20%–80%, while its storage conditions range from –25°C to 55°C.  Compatible printers include the HP DesignJet T920, T930, T1500, T1530, T2500, and T2530 series.