<ul> <li>3-pen set of high-precision technical pens with refillable ink reservoirs is perfect for college-level students</li> <li>Drawing pens feature wear-resistant, hard chrome-plated thin tips that allow exquisite detail work</li> <li>Isograph pens include refillable ink reservoirs that are ideal for frequent drawers</li> <li>Push-on sleeve provides easy access to ink helix and fast cleaning of Isograph pen</li> <li>Pens come in 0.2mm, 0.3mm, and 0.5mm</li> </ul>