The standard colors of these solidified paint markers are perfect for high temperature use. Thermal resistance of standard color paint: 200°C to -10°C (392°F to 14°F). Fluorescent paint colors are recommended for indoor use. Twist end of barrel to advance the marker tip, point will not retract. 1/2" wide pointed tip. Waterproof, pigment-based solid paint. Can write on virtually any surface, dries in minutes. Standard colors are fade-resistant.