BDF S4MC Window Film Security and Safety Clear 4 Mil (24in X 23ft) MINIMIZE PROPERTY DAMAGE by absorbing impacts from break-in attempts and holds shattered glass together PASSES ANSI Z97.1 CLASS B, CPSC CATEGORY 1 testing requirements. INCREASE SECURITY or add safety to tempered or non-tempered glass. CRYSTAL CLEAR, high quality film with 99% UV REJECTION, this film is applied to the interior side of the window STRONG ADHESIVES and film to slow down intruders Provides clear visibility for rooms that require less view shielding; not intended for privacy purposes. Window film is to be applied on the inside of your window unless specified otherwise. Perfect for ground-level rooms that are easily approachable by unwelcomed passersby.