Use these fine and bold line pens to experience smooth writing, and crisp ink quality. They delivers precise points and lines and are ideal for shading, layering, and crosshatching.Details:Cool gray3 pens total ( 3 sizes)Ideal for sketching, drawing, and illustrationWaterproof, chemical and fade resistantBleed-free and quick dryingpH neutralSize Information:Micron 01 (0.25 mm)Micron 05 (0.45 mm)Micron 10 (0.6 0mm)