K-51 markers feature high-quality dye-based inks. Vibrant, translucent colors are water resistant. The durable extra-broad tip has two edges for different line widths and versatility. Writes on most surfaces: Metal, canvas, painted surfaces, wood, glass, plastic, and paper are all great surfaces for Krink inks. Large ink capacity of 30ml. Quick drying. Great for a variety of art, craft, and industrial uses.Highest quality. Handmade in the USA. Xylene free. Conforms to ASTM D-4236