Use this light cool gray pen set to experience smooth writing, and crisp ink quality. Each pen delivers precise points and lines that are ideal for shading, layering, and crosshatching.Details:Light cool gray3 pens (3 sizes)Ideal for sketching, drawing, and illustrationWaterproof chemical and fade resistantBleed-free and quick dryingpH neutralContents:Micron 01 (0.25 mm)Micron 05 (0.45 mm)Micron 10 (0.60 mm)