Won't dry out leave cap off up to ˝ hour! Bold marking, permanent ink provides high visibility. Marks on virtually any surface, including cardboard, metal, and plastic. Quick drying; water and rub resistant. Durable chisel tip marks in a variety of widths. Low odor. ACMI certified to meet Federal standards of nontoxicity; safe for office, school, or home. Conforms to ASTM D4236.