Black Witches Silhouette Yard Sign Cutouts, Halloween Decorations Outdoor Props, 2 Witches, 1 Black Cauldron Yard Cutouts With Metal Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Black Witches 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.