Best Quality Reproduction Back Glass Weatherstripping Black Dense-Cell EPDM Synthetic Rubber For Long Service Life Extruded To Exact Original Profile Weatherstrip Corners Molded & Vulcanized Fits 2 & 4 Door Sedan Models Rear glass replacement for your 1956 & 1957 Chevrolet Bel Air, 150 or 210 is a major job that needs to be done right the first time. This rear glass weatherstrip is made of ethylene propylene diene monomer or EPDM, a heavy, long lasting, dense-cell synthetic rubber specially formulated for this purpose. Made to factory specifications, this rear glass weatherstrip has the correct size, shape and contour including all the correct grooves for the glass, body and anti-leak ribs, as required. In addition, vulcanizing of the molded ends and corners, where applicable, ensures a correct fit and maximum durability.