For big tough jobs, choose the popular Solid Marker. It marks through oil, grease, rust, mud, snow - inside or outside. It is absolutely permanent. Solid markers won't fade or wash off like chalk. The special "stay fresh" twist top keeps paint fresh and ready to use. - Used by divers to mark things underwater. - Used on construction sites to label anything exposed to the weather. - Used by auto recyclers to mark sheet metal, auto parts, windows. - Applications: Steel, Rubber, Cloth, Plastic, Cardboard, Wood, Glass, Concrete, Stencil Craft projects. - Available in Yellow #3, Black #49, Red #19, Blue #36, Green #29