Acrylic sign holder for suction cup mounting of 22" x 28" poster-size signs. Great for displaying posters back to back on glass doors or windows. Display one message for outside viewing and another for inside. Made of strong 1/8" clear acrylic and held securely in place by four suctions cups. Posters are easily inserted through sides or top. Overall dimensions: 28" H x 25-1/2" W, leaving 1-3/4" of clear acrylic showing on each side.