Black #80 permanent ink marker. Dura-ink is the must-have, multi-purpose felt-tip marker that all jobsites, workshops and shipping department. Markal has the perfect color, shape and size marker for your needs. Inside the toolroom, warehouse, on the production line or at the construction site, dura-ink are unbeatable in versatility. With heavy-duty plastic and metal barrels and high-intensity colors, dura-ink is the marker of choice for every industrial application.