The barrel of the Titanium Inka Pen is machined from solid aerospace-grade Titanium and the pen components are built from carbon fiber composite. This makes the pen impossibly light at 0.45 oz., extremely strong and durable and corrosion resistant in any environment. Lightweight, watertight and built to withstand harsh environments, the pressurized ink cartridge ensures the pen will write wet or dry at any angle, any temperature, and any altitude. It also features a stylus for operating a PDA. The Inka Pen is manufactured in the U.S.A. under the strictest quality control standards and is designed and built to last a lifetime.