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About product and suppliers:
        Alibaba.com offers 443 duplex paper board gray back products. such as waterproof, antistatic. You can also choose from free samples. 

There are 441 duplex paper board gray back suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and South Korea, which supply 98%, 1%, and 1% of duplex paper board gray back respectively. 

Duplex paper board gray back products are most popular in Southeast Asia, Mid East, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 311 with ISO9001, 34 with FSC, and 12 with Other certification.