About rOtring Since its founding in Germany in 1928, rOtring has dazzled the technical writing world with products that unite art and industry. Drawing inspiration from Bauhaus thinking and aesthetics, rOtring products are engineered with German precision to deliver premium performance. Whether in architects' offices, universities, schools, or artists' studios, rOtring products enable you to follow your inspiration wherever it takes you. Easy-to-Refill Ink Reservoir The Isograph pen is equipped with a refillable ink reservoir that is ideal for frequent drawers. Use high opacity, fast drying bottled inks to refill your Isograph pen with no fuss. The patented push-on sleeve allows for easy access to the ink helix and for fast cleaning, so you can focus on what matters. Work with a Pristine Pen Keep your Isograph pens in pristine condition with rOtring Cleaning Fluid for technical pens. The patented push-on sleeve allows for fast, easy cleaning of the ink helix. Whether you're between uses or preparing to switch ink colours, ensure that your Isograph pen is as precise and functional as you need.