Tuff Guy™ Marker, Black, Medium, Threaded CapHeavy duty, quick dry, truly permanent ink marker which is xylene free Valve action marker features a fiber tip and an industrial strength ink ideal for permanent identification of parts or accessories The clear, crisp marks resist fading even when subjected to varying, extreme climates Won't rub off slick surfaces like plastics and shrink wrap Permanent ink writes on smooth surfaces such as metal, aluminum, steel, plastics and more