The Original GrandWheel window visors are manufactured with the polycarbonate. Other use acrylic material that cannot be same flexible and durable like polycarbonate. The GrandWheel window visors are engineered by using cutting-edge technology to reduce noise, deflect rain whilst and keep cabin cooled. The 4-piece set comes with easy to install 3M tape and installation manual. Specifications: - Condition: 100% Brand New; - Fitment: for Silverado 1500 2007-2013 Crew Cab; for Silverado 2500 2010-2014 Crew Cab; for Silverado 2500HD,3500HD 2007-2014 Crew Cab; for Avalanche 2007-2013; for Suburban 1500 2007-2014; for Suburban 2500 2007-2013; for Sierra 1500 2007-2013 Crew Cab; for Sierra 2500HD,3500HD 2007-2014 Crew Cab; for Yukon XL 1500 2007-2014; for Yukon XL 2500 2007-2013; - Package includes: 4 pcs window visor deflectors (2 front/2 rear), prep pad, installation manual; - Color: Smoked black tinted; - Material: High quality polycarbonate. Features: - Fresh air even while raining; - Reduces sun glare; - Easy installation; No-drilling required; - In-channel installation; - Custom fit.