FixtureDisplays Sandwich Menu Board A-Frame Sidewalk ChalkBoard Promotion Sign Wood 10235BLAK Doublesided Blackboard Sidewalk Sandwich Promotion Board. Easy to set-up with a A-Frame construction - portable. Great for any retail location; restaurants, storefronts, coffee shops, hotels, schools, weddings or any event - the possibilities are endless!! Writing area: 17" x 29". Total size is: 20" x 40" Material: quality pine solid wood frame with clear coat Work best with liquid chalks. The black surface is melamine finshied MDF, takes chalk (not as sticky as traditional black paint), as well as liquid chalk markers. For dry erase markers, please follow this link: https://www.amazon.com/dp/B00LFATUXC. Shipping to Canada and Mexico: import duty and fees apply.