This fineliner uni-ball pen features water resistant ink and is perfect for professional artists and beginners alike wanting to add an extra touch to their work. This pen can be used easily with watercolour work, as the ink will not smudge when wet and is great for creating outlines or adding more contrast to a drawing. The 0.1 size nib is ideal for intricate detail, as it creates the finest lines. . Ideal for drawing, technical drawing, outlining and sketchbook doodles. Nib size 0.1. Durable steel nibs. Approximate Dimensions (mm) H 138.5 W 12.9 D 12.9