Filled with dye-based, translucent Krink, the K-51's double-edged tip brings line variance and versatility to any surface. The extra-broad, valve-action tip allows artists to produce thick bands of vivid color. The chisel tip makes this marker excellent for large calligraphy work. 30 ml Highest quality. Handmade in the USA. Xylene free. Conforms to ASTM D-4236.