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About product and suppliers:
        Alibaba.com offers 771 hardness :4h products. About 1% of these are charcoal, 1% are plywoods. 

A wide variety of hardness :4h options are available to you, such as free samples, paid samples. 

There are 776 hardness :4h suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Thailand, and South Korea, which supply 99%, 1%, and 1% of hardness :4h respectively. 

Hardness :4h products are most popular in North America, Eastern Europe, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 333 with ISO9001, 97 with Other, and 32 with ISO14001 certification.
        
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