Inka^TM is a compact, precision-crafted all-weather pen that is engineered to perform in extreme environments. With its sleek, lightweight, stainless steel cylindrical design and pressurized ink cartridge, it writes at any angle, temperature, altitude and even underwater. Perfect for the outdoor enthusiast - from pilot to scuba diver, mountain climber to fisherman, Inka's innovative design enables it to transform from a quick-use pen to full-size writing tool. Inka's key-ring easily and securely attaches it to clothes or gear. Inka is made in the U.S. and has a lifetime warranty. Refills available.