Signicade MDX Signs are made of plastic so no rust, splinters, or discoloration, no maintenance. They can be used both indoors and out! Change signs  in seconds with their patented Quick-Change feature. Signs slide easily in and out-no fasteners or tools needed. They have a narrow footprint and are lightweight and easy to move, but can be filled with sand for weight to    keep them from tipping. Use corrugated plastic sign or other rigid sign    material up to 3/16" thick.