HSSM produce writing board steel coils , which have different colors,white , green , black , yellow . We are the biggest factory which produce writing board panel in the world . The base metal of the writing board coils are SGCC .  The main specifications are  0.27*1200*C, 0.3*1200*C, 0.4mm ,0.5 ,0.8mm and so on .  The minimum order quantity is 20MT .  If you need in any contry please contact me . E-mail :  rechard.jiang@szhssm.com , MSN : jiangyuan8319@hotmail.com  tel:86-13372148521