What size does watercolor flat pen 4k fit?

Number eight. Watercolor flat pen 4k is a special watercolor pen. There are two kinds of special watercolor brushes: flat brush and round brush. Most watercolor pens use natural and synthetic materials, and watercolor pens are expensive. For ordinary watercolor pen lovers, ordinary watercolor pens are enough. Watercolor flat-headed pen 4K is more suitable for size 8. To sketch or create, you need to prepare three kinds of round-headed brushes and one or two kinds of flat-headed brushes. Watercolor pen, a painting tool. Watercolor pen is a common painting tool for children. The material of the nib is generally carbon fiber, which is usually sold in a box of 12, 24, 36 colors. The pen tip is generally round, and the two colors are not easy to blend together.