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 B PIPE MARKERS ARE 1.125"X8" IN SIZE, WITH .75" LETTER/CAP HEIGHT, AND MADE FOR PIPE DIAMETERS OF 1.5" TO 2"