Chalk Board 1.For making white board,chalk board 2.Apply for chassrom, office. 3.Competitive price Chalk BoardFeatures: 1) Thickness: 0.23mm, 0.25mm, 0.27mm ... clients3) This kind of products are used in schools, offices and so on4) Material: galvanized steel, or cold roll.5) Surface ... ) Colors: White, green, black.7) plain or with grid line. Chalk Board