Get your imagination on paper or vellum through clear sketches using the Koh-I-Noor® Radiograph® technical pen. The technical pen comes with a stainless steel drawing point for enhanced durability and precise lines. This refillable pen features a see-through cartridge that allows you to see the quantity of ink during use. Its airtight double seal dry cap prevents the tip from drying and facilitates instant startup. Recommended for graphic art applications and drafting, this technical pen delivers a line width of 2.60mm for clear lines.