writingboard for office used/magnetic dry erase surface/various sizes available Filling: PP(plastic) frame,white cardboard(backside), special cardboard(core),whitelacquered steel(frontside), two rope. Size 1: Plastic frame whiteboard (A),thickness=6.4mm 300*200mm(A4) 300*440mm(A3) Size 2: Plastic frame whiteboard (B) thickness=12.8mm 300*200mm(A4) 300*440mm(A3) 600*440mm Use: using board-pen to write upon this item ,attract memo magnet/magnetic items to stick on it,etc Coming together is beginning,keeping together is progress and working together is success. Sincerely waiting for your friendly response.We company is located in the city of oriental country --Shanghai,China .Wonderful business relationship we company hope to deal with you. Contack name:Alice Mobile Phone: 13564103356 Telephone: 86-021-59294998-8005