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About product and suppliers:
        Alibaba.com offers 128,154 single grade products. About 4% of these are hair extension, 1% are aluminum foil, and 1% are green tea. 

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

There are 128,154 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, Domestic Market, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 29,192 with ISO9001, 17,004 with Other, and 4,464 with ISO13485 certification.
        
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