Plus 5 Athletic Field Marker is made from finely ground marble. It is a high quality marble marking powder that was developed for use on all types of athletic fields. This ground marker will flow freely from any type of applicator with no caking, clogging or "splotches." Plus Five Athletic Field Marker provides a highly visible, sharply defined, brilliant white marked line. Advantages include that it is economical, easy to apply, safe to skin, safe to clothing, will not harm turf and leaves a bright, sharp and distinct line.