Double-sided Sidewalk Sandwich Board Sign with (2) 20" x 42" Write-on Blackboards, A-frame Sign Works Best with Wet and Dry-erase Markers, Dark Brown Wood Framing Two-sided sandwich board offers 2 write-on surfaces for creating custom presentations. Write-on blackboards work with wet-erase, dry-erase and liquid chalk markers (not included.) 20 x 42 write-on surfaces provide a large space for creating eye-catching announcements. Quality wood frame looks great outside of restaurants and retail stores. Displays2go SKU#: AFM2042BWRES