The dual-function Inka Mobile Pen and Stylus 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. Flip it over to access the touch-screen stylus - perfect for everything from quick notes to business presentations. With compact size, durable construction, reliable performance, and a replaceable pressurized cartridge with waterproof blue ink,, the Inka Mobile is designed to be everything you need in a pen and stylus.