The Intuos4 Inking Pen from Wacom is a pressure- and tilt-sensitive drawing pen, for use with the Intuos4 tablet. The pen is designed to mimic the feel of using an ink pen on paper. Place a sheet of paper on top of your tablet and the inking pen can draw on the paper, simultaneously recording your motions to a digital file.
The pen includes a silver ink cartridge as well as 2 inkless nibs. This allows you to use the pen as a standard tablet input, or to actually draw on paper with silver ink.