coated duplex board for b grade : we are a big manufacturer and exporter of coated duplex board in china. it is only used for industrial packing and printing, such as colored printing for a single side and making boxes and cartons for packing etc. our items find a good sale in south-east asian, european and middle-east countries markets thanks to high quality,competitive price & good services. the info as follow : substance :220-500gsm with grey back/250-500gsm with white back size : sheet/reel packing : seaworthy packing if you are interested, pls do not hesitate to contact with us.