Displays2go A-Frame Sidewalk Sign for 22 x 28 Posters with Separate Headers, Aluminum Snap-Open Framing, Double-Sided - Silver (AFS2228HDR) Double-sided sidewalk sign for 22 inch by 28 inch posters. Snap-open, front-loading poster frames allow for instant updates. Separate header areas hold a 22 inch wide by 8.5 inch tall sign. Lightweight aluminum construction makes each unit easy to reposition or move.