Premium Aluminum：The “Caution Slippery When Wet Or Icy” signs made of high quality rust-resistant aluminum. It can be used indoor as well as outdoor. Reflective Material: Our letters are visible reflective under lighting conditions to ensure easy reading in the dark. High Quality : This metal sign is sturdy enough and has excellent printing effect. Rust-proof, fade-proof, weatherproof. The pattern are protected from weather and graffiti. It can remain as new after years of use. Easy to Install：With 4 predrilled you can hang them from the surface including walls, gates, fences and poles. Warm Tips: Welcome! If you encounter any problems during the purchase process, please let us know, we will help you and make things right.