Black A-Frame Chalkboard Sidewalk Sign with Slide-out 18x26 Black Boards for Easy Updating, for Wet Erase and Traditional Stick Chalk - Wood Two, slide-in 18 x 26-inch boards allows you to design messages prior to them being displayed. Folds flat for easy transportation and storage. Double-sided enables advertising from multiple directions. Use with traditional stick chalk, liquid chalk and wet-erase neon pens. Displays2go SKU#: AF1826RBKES