Smartsign S-8874-PL-14"Notice: Security Door Must Be Kept Closed" Plastic Sign, 10" x 14", Black/Blue on White 55 mil thick, made of polyethylene, a tear-resistant plastic Lightweight, semi-flexible and easy to install Rounded corners and predrilled mounting holes Resistant to chemicals and water Recommended for indoors 1-3 year life outside Made of 50% recycled plastic