BDF S4MB35 Window Film Security and Sun Control 4 Mil Black 35 (Medium) - 30in X 14ft MINIMIZE PROPERTY DAMAGE by absorbing impact from break-in attempts and holding shattered glass together. EXCELLENT UV & HEAT REJECTION with unmatched optical clarity & transparency. Reduces fading of interior furnitures caused by the sun. STRONG ADHESIVES to last many years. For easier installation, remember to use A LOT of soap/water mixture to soak both the adhesive side and window. HIGH QUALITY PERFORMANCE films that are sensitive by nature. Please remember to take caution when handling the film as the slightest fold will create a permanent wrinkle. FREE TOOLS AND EASY INSTALLATION GUIDE to make installation DIY-friendly. Make sure window surface is completely clean and absolutely free of any blemishes.