Uni-Ball Ultra Fine Brush Marker Pin Black Polyacetal tip. Plastic body (PP). Uni Pin markers are ideal for professional drawing, artistic drawing and writing, offering a crisp and smooth stroke at the same time. Pigmented ink with high water resistance, which means that once dry it cannot be erased even if water is spilled on the page. It is also highly resistant to light and its colour does not fade even when exposed to direct light. Provides clear and clean lines. It has an extra fine brush tip with synthetic bristles.. Colour: Black Brand: Uni-Ball