Karl Lagerfeld has another unexpected side project in the works. French luxury goods brand S.T. Dupont has tapped the designer to create a range of stylish highlighters and pens–but not just any pens. Karl, who famously uses Shu Uemura nail polish to sketch his designs, somehow incorporated the polish into the ink of the pen to create a “burgundy lacquer,” according to WWD. Also, the writing instruments are apparently “fan-shaped” so that they fit neatly between fingers and won’t roll off of your desk.