Energy saving PVC strip doors. Formulated with standard (indoor/outdoor) ingrediants, the operating temperature range is -10 degrees to 150 degrees F. Smooth crystal-clear material. Overlaps insure easy access while contolling the loss of heated or cooled air. Includes 2 each orange safety strips to outline the opening. Patented MaxBullet-HTP® (high-tensile polymer) mounting system has completely revolutionized the way strip doors are installed. No bolts, nuts, bars, etc. Pre-punched strips simply and securely snap onto bullet shaped studs. Lifetime guarantee on mounting hardware against breakage.