Uni-Ball Calibrated Pen Pin Dark Grey 0,1mm Polyacetal tip. Plastic body . Uni Pin calibrated pens are ideal for professional, artistic drawing and writing, offering a sharp yet smooth stroke. Pigmented ink with high water resistance that makes it non-erasable once dry even if water is poured on the page, it also has high light resistance and its colour does not fade even when exposed to direct light. Stroke thickness: 0,1mm Colour:Dark Grey Brand: Uni-Ball