The bulk roll format allows you to save money by cutting the strips to length, and punching the holes yourself. The Scratch-Guard Ribbed material offers superior scratch resistance. The Non-Stick surface reduces static cling for safer entry. For indoor or outdoor applications with temperature ranges of -10 Degree to 150 Degree F. Finished edges are rounded to prevent cupping and curling, promoting a tighter seal between strips. Specially fabricated to hang straight without warping, even in extreme temperatures. Will not discolor with exposure to sunlight.