Roof flashings thermoplastic base"no-calk" 9-1/4 inches x 13 inches base opening size 2 inches Slides over pipe for pitch to 45 degree. Non-fading and non-cracking, rigid black thermoplastic base. Non-fading, sealing collar. Rated 180 degrees Fahrenheit continuous heat. Not for hot-mopped or built-up roofs. Do not use petroleum-based products on pl astic bases or rubber collars.