wooden blackboard 1. it can be written in both chalk and Permanent marker 2. the material is wooden frame , the thickness of the frame is 2cm,the width of the frame is 4cm blackboard is made of three part ,the surface is a metal sheet ,the middle is 3mm MDF and the bottom is a metal sheet 3.it can be used in many areas ,such as school ,wine bars, hotel ,office ,supermarket and so on . 4. the sizes can be customized