St. Patrick's Day 2023 Yard Sign Cutouts Irish Shamrocks Ornaments Yard Decoration Saint Patrick's Day Party Outdoor Yard Signs With Metal Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Shamrocks St. Patrick's Day Yard Cutouts Outdoor full color direct printed graphics are vertically fluted for use with a Stakes. Coroplast is used for yards, parking, real estate, and election signs. They are waterproof.