Private Property Sign - 3 Pack Due to the cutout design the message will not fade away over time like currently available metal or plastic signs. Patented design elements allow it to attach easily and quickly without costly additional hardware. Made out of the same material (HDPE) as highway construction barrels giving it unsurpassed durability and visibility. The rigid characteristics of plastic coupled with the engineered thickness of 2.25 mm allow the sign to maintain its shape and have the additional benefit of forming to a curved surface when desired. Additional mounting holes and slots for nail and zip tie mounting.