OUR SELF-ADHESIVE VINYL PIPE MARKERS ARE MADE OF FLEXIBLE, RESILIENT, 4 MIL THICK VINYL WITH A STRONG ADHESIVE BACKING. RESISTANT TO WEATHER, MOISTURE AND CORROSIVE CONDITIONS. DESIGNED FOR INDOOR AND OUTDOOR USE AND ADHERES TO MOST CLEAN, DRY SURFACES. THESE STYLE A PIPE MARKERS ARE 2.5"X12" IN SIZE, WITH 1.25" LETTER/CAP HEIGHT, AND MADE FOR PIPE DIAMETERS OF 2.5" TO 6"