Sharpie 13601 Industrial Fine Point Permanent Marker, Withstand Up To 500F, Designed for Industrial and Laboratory Users, Black Color, Case of 12 Dozens Bold ink is engineered to withstand intense heat up to 500F Specially designed for industrial and laboratory users Fine tip creates bold, detailed lines on a variety of surfaces including metal, glass, film and plastic Quick-drying permanent ink is water, fade and smear resistant Black Color, Case of 12 Dozens