Bernie Sanders Chair Mittens Yard Sign 18" x 24" - Coroplast Visible Text Bernie Sanders Mittens Cutout Yard Sign Decor with Metal Stake. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These outdoor 18" x 24" Bernie Sanders Mittens Cutout Yard Sign full color direct printed graphics are vertically fluted for use with an H-Stake. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.