Nite ize inka mobile pen and touch screen stylus product description the inka mobile is designed to go where you go write where you need it to write and stay where you want it to stay so its always conveniently at hand made of durable nylon and carbon fiber thats tough lightweight and corrosion resistant one end 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