Smart choice. HP 90 Ink Cartridges produce consistently outstanding results from accurate line drawings to photo-quality color images. Patented dye color and pigment-based black HP ink formulations are designed together with HP Designjet 4000 Printers for fast, reliable, cost-effective performance. To ensure consistent results, HP Smart Printing technology makes automatic adjustments to optimize print quality and enhance reliability. You get sharp black line accuracy, rich color, and smooth transitions. HP's modular ink delivery system enables individual replacement of supplies and allows you to select the cartridge size that fits your usage needs. And HP Smart Printing technology provides alerts when ink is low or out.