we are professional manufacturer and exporter for coated duplex board which is usually used for simple packing and printing. ordinarily, the specification in our mill is below: coated duplex board, b grade 1.white back:250-500gsm 2.grey back:220-500gsm we are hoping to establish relationship with you , if you are interested in our products please tell us know and we will willing to service for you. zhenchung paper products corporation address: 6 / 6f, jinhe building no.21zhishan road, guilin, 541002 china tel: +86 773 3111 706 (direct line) 3111 702 , 3111 703 , 3111 705 fax: +86 773 3111 701, 3111 709 email: aclcn06@126.com