These chisel tip markers are able to create thick and thin lines for detailed works of art. The durable tip lasts even after writing on rough surfaces, making it perfect for all uses: executives, teachers, kids, and students at home, work, and school. Their bright colors can create an eye-popping and vibrant impression. Our ink pigment is made smear-proof and quick-drying. This item is safe for use for the intended purposes and conforms to ASTM D-4236. It can be used on paper, metal, glass, wood, photos, coated paper, and even on rough surfaces. Ideal for drawing, writing, coloring, scrapbooking, doodling, detailed marks, and more. The ink is waterproof, smear-proof, and fade-resistant. Each box includes 12 markers in assorted colors. Sold as 3 packs for a total of 36 markers.