BDF S4MS15 Window Film Security and One Way Mirror Silver 4 Mil (48in X 12ft) MINIMIZE PROPERTY DAMAGE by absorbing impact from break-in attempts and holding shattered glass together. EXCELLENT DAYTIME PRIVACY while reducing both heat and glare. 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.