Inka Stainless Cartridge Write Anywhere Pen, Medium Point, Blue Ink (IP-172)
The Inka Pen - Take it where life takes you! Converts easily from a quick-use pen to a full-size writing instrument. Attaches securely wherever you need it with a stainless steel split-ring attachment. Waterproof ink writes upside down, in extreme temperatures and at any altitude. Durable stainless steel and carbon fiber materials. Includes a PDA/touch screen stylus.