Ray Display Systems Pvt. Ltd. Offers Chalk Board with Tough Matt Coating. Ray Display Systems Pvt. Ltd. Is the manufacturer of display systems and writing boards. Chalk Board with Tough Matt Coating does not allow the chalk particles to form a layer which would have to be cleaned with a wet cloth. Chalk Board with Tough Matt Coating requires no maintenance like repainting or regrinding of glass. It is available in various ranges of sizes. It is available in black, blue and green colour.