Our Mighty Metal Markers are equipped with a precision stainless steel rolling ball point writing tip that glides effortlessly on any surface. Marks are bright, opaque, and sharply defined. Marks will withstand extreme weather conditions, washing, oil, grease, or rubbing without losing brilliance or legibility. Brilliant marking capabilities. Proprietary ball-point design with pump-activation. Waterproof and writes underwater! Industrial grade. Marks last outdoors for 15+ years.