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"