The Lamy Twin is fitted with a ballpoint pen and a touch screen refill for your PDA or a 0.5mm pencil. Great cylindrical shape and with an easy twist this pen combines two writing systems in one. Built with reliable mechanisms and sturdy barrels, any of these pens will serve you diligently for years. A built in eraser for the pencil along with spring operated solid stainless steel clip makes this a smooth writer.