ProSeal garage door bottom seals are made of durable weather resistant vinyl. The high quality PVC remains flexible at extreme low temperatures, providing a tight seal for your garage door. ProSeal locks out the elements by conforming to the shape of your garage floor. Helps save energy, by keeping your garage warmer during the winter and cooler during the summer. Complete kit includes (5) 4 ft. PVC tracks, flexible PVC seal and galvanized mounting screws. Product Features:Includes (5) 48 in. x 1 7/8 in. tracks, seal and mounting screwsSeal measures 3.5 in. wide when layed flatDesigned for wood and roll up garage doorsTracks made of durable ridged PVCSeal made of flexible PVC