Flange acts like a gasket, sealing off the sub-floor and preventing air and moisture infiltration under the threshold Helps keep the door frame from racking and the sub-floor from swelling and warping Eliminates the need for caulking Adheres to concrete, wood and metal surfaces Self-adhering, 100 percent waterproof, mold and mildew resistant Designed for all entry/patio doors Exceeds all building codes and manufacturers installation specifications Wdth In x Lgth Ft=5.5 x 25 Color=Black