The Calligraphy Duo by Ooly is a set of 12 double-ended calligraphy pens designed for writing and hand lettering. Each pen features a cylindrical shape with a smooth grip, making it comfortable to use for extended periods of time. The pens come in a variety of colors with multicolor ink and a chisel point type suitable for creating bold, 2mm and above, or finer 0-3mm lines. Perfect for kids and adults alike, this set is a great addition to any artist or craft enthusiast’s supplies.