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About product and suppliers:
        Alibaba.com offers 126,002 single grade products. About 4% of these are hair extension, 1% are inverters & converters, and 1% are carbonate. 

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

There are 126,002 single grade suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of single grade respectively. 

Single grade products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 29,690 with ISO9001, 15,788 with Other, and 4,750 with ISO14001 certification.