For sketching, outlines, school or as a simple fineliner: Blackliners, made in Germany, have a water-based archival ink and are resistant to water and chemicals, too. The robust metal-encased 0.05 mm - 1.0 mm, chisel and round tips guarantees fine and exact lines - perfectly suitable for outlines. Due to their "Cap off" function the marker are protected from drying out for up to 180 minutes. The high-quality Blackliner have a slip-proof, matt surface.