Markal ST.2100 is a metal-ball tip marker with an aluminum squeeze tube and thick paint for vertical and overhead surfaces. The ST.2100 contains low levels of chlorides, halogens, low melting point metals, and sulfur. Available in five colors, the low corrosion paint formula is safe for use on stainless steel, alloys, and other superalloy metals and will not contribute to unwanted corrosion, degradation, or pitting from use.