The dual-functioning Inka Mobile Pen and Stylus (Smoke) is designed to go where you go, write where you need it to write, and stay where you want it to stay, so it's always conveniently at hand. Made of durable nylon and carbon fiber that's tough, lightweight, and corrosion-resistant, the top of the Inka Mobile features a carabiner clip that securely anchors to a key ring, zipper pull, or nearly any loop or D-ring, so you can always know where the pen is when you need it. The pen on one end and touch-screen stylus on the other are each capped in transparent plastic, allowing you to see which is which at a glance. With its replaceable pressurized cartridge of blue waterproof ink, the pen writes smoothly and consistently in extreme temperatures, upside-down, and at any altitude - even underwater.