The tip uses a strong tip so it can be used on rough surfaces such as concrete and wood. It is resistant to fading and is resistant to wet surfaces, so it is also recommended for outdoor work. Permanent markers; Quick drying, water resistant, alcohol resistant; Can be used on coarse surfaces such as concrete, surfaces that are wet with water, such as plastic, metal, and smooth surfaces such as craft tape, etc. Line thickness: 0.04 - 0.05 inches (1.0 - 1.3 mm); Ink: Oil-based pigment; Size: Maximum diameter 0.5 inches (12.4 mm) x total length 5.1 inches (131.0 mm); Weight: 0.4 oz (11.0 g); Ink color: Black; Art Supplies Shop Dot Com Postcard A; Limited Product! 1 x Cute Animal Postcard