The K-90 marker has a durable steel rollerball tip that allows for detailed work on a wall or on paper. It contains opaque, alcohol-based paint in a metal casing, and features a unique pump-action delivery system that ensures smooth flow of paint. Writes on most surfaces, rough or smooth. Colors do not fade, peel, chip or rub off, and are water resistant. Contains no harmful solvents and conforms to ASTM D-4236. Handmade in the USA.