For sketching, outlines, school or as a simple fineliner: Blackliner Made in Germany have a water-based archival ink and are resistant to water and chemicals, too. The robust metal-encased 0.05 mm - 0.4 mm tips guarantees fine and exact lines – perfectly suitable for outlines. Due to there "Cap off" function the marker are protected from drying out for 90-180 minutes. The high-quality Blackliner have a slip-proof, matt surface. Set 1 consists of 4 markers with the following stroke widths: 0.05 mm, 0.1 mm, 0.2 mm, 0.4 mm