Grip it! Comfortable rubber grip. Vibrant fade resistant ink. Long lasting durable tip. Marks on most surfaces: glass, metal, plastics, photos, foils, coated papers, oily and damp surfaces. Other markers dry out, we don't (if cap is left off for up to two weeks)! ACMI - Art & Creative Materials Institute Certified. Conforms to ASTM D 4236. Non-toxic.