Signworld Outdoor Sidewalk Sign (Water Filled Base) Recommended for both Indoor/Outdoor use Simple to change graphics with Snap Open Frame (Does not include poster). Make sure your poster prints is made for outdoor use. Can display (2) 23.5" X 33.5" Banners Posters. Base can be filled with sand or water for added stability Spring shocks allow the stand to sway back and forth in high winds