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About product and suppliers:
        Alibaba.com offers 3,577 grade sole products. About 4% of these are oxide, 1% are carbonate, and 1% are alcohol & hydroxybenzene & ether. 

A wide variety of grade sole options are available to you, such as free samples, paid samples. 

There are 3,577 grade sole suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of grade sole respectively. 

Grade sole products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 663 with ISO9001, 173 with BSCI, and 143 with Other certification.