Size is 24 inches X 24 inches. Available in sizes up to 48X96.
There's nothing like them on the market.
The chalkboard surface is the highest quality porcelain on steel. The panel construction is composed entirely of non-porous materials to give the board extended outdoor life - free from excessive warping and moisture absorption that you would experience when exposing a standard chalkboard to the elements.
Anodized aluminum frame is impervious to weather.
Use with a regular chalk or markers sold by billyBoards