Security Sign - Slippery When Wet - #447 We manufacture and sell ONLY the Highest Quality Signs that are made This is a 100% Weatherproof UV Protected sign that will not Rust, Fade or Crack. This is an AUTHENTIC 6" X 9" Security Property Sign designed for outdoor or indoor use. Our signs will protect your family and property. Showing your property is professionally protected will keep away 99% of would be thieves.