Prime-Line Products P 8761 Zipper Pile Weatherstrip for Windows & Doors, 250 ft., White, Owens Corning, Non-Adhesive Used on windows & doors to improve energy efficiency by sealing gaps and leaks which allow outside air to enter, and inside conditioned air to escape 3/16 in. width x 1/4 in. height x 250 ft. length Constructed of white pile fibers Woven pile weatherseal material with zig-zagged NON-ADHESIVE backing