Uni Pin Pigment Ink Pen shows a needle-shaped nib, which is consist of nylon tip and metal body. Features of nylon make sure the service life of the nib will be long enough to use out the ink and the width of stoke is stable. The needle-shaped nib also guarantees the stroke to be the same. The metal body guarantee the stability of the nib. The specific Pigment Ink is specially invented for detail drawing and technical blueprint drawing. Its colour is long-lasting and light-resist, which is important for long-term storage. The ink is also water-proof and fast-dry to make the work easier. Uni Pin Pigment Ink Pen is a good choice for draft drawing, blueprint drawing and detailed painting. Sakura Pigma Micron Pen is also highly recommended. This set contains 12 pens 0.03 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 2 of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm and a brush pen.