Black Cat Silhouette Yard Sign Cutouts, Halloween Decorations Theme Party Props, Cutouts, Standees, Yard Cards With Metal Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Black Cat Silhouette Characters Yard Cutouts Outdoor full color direct printed graphics are vertically fluted for use with a Stakes. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.