Opaque metallic permanent ink. Marks on most surfaces. Fade- and water-resistant ink. Great for dark surfaces. AP - ACMI (Art & Creative Materials Institution Certified). Conforms to ASTM D-4236 www.sharpie.com. We would love to hear from you 1.800.346.3278. Experience Sharpie More: Ultra Fine; Twin Tip; Retractable. Chisel. Assembled in USA.