These 1956-1958 Corvette Convertible Reproduction Tops include Kee Auto Tops' Exclusive 8 Year warranty. How can we offer such a long warranty? Simple. We know that our premium quality materials and workmanship will result in a top that will look great on your car for a very long time. For example, our tops are constructed with Sateen bow sleeves, instead of cheaper cotton or bow drill. Seams are dielectrically sealed (carefully…so that we don't press out the grain in the material from the heat-seal process) Only premium polyester thread is used for all sewing operations, which ensures a much stronger seam than cheaper monofilament thread. Our vinyl convertible tops are made from 36 ounce pinpoint vinyl material, with all patterns cut with computerized efficiency.