30ml capacity. Alcohol-based paint is permanent and opaque. Excellent for use on, metal, coated paper, and painted surfaces. 3mm steel roller-ball tip writes on most surfaces, rough or smooth. Unique pump-action allows for easy flow control. Steel tip writes on almost any surface. Thick paint creates distinct lines. Handmade in the USA. Conforms to ASTM D-4236. Prop 65 compliant. Warning: Flammable and may cause irritation. Keep away from children.