A disposable version of the refillable liquid-ink pen that offers the same high quality plots with none of the mess or maintenance associated with the refillable. The DPP® is a two-part system comprised of the nib and a pre-filled ink cartridge. Four different styles of ink cartridge are available to enable work on all of the major plotters. Inks are black permanent archival pigmented systems. Direct fit for Hewlett Packard drafting and compatible plotters.