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About product and suppliers:
        Alibaba.com offers 128,373 single grade products. About 4% of these are hair extension, 1% are household gloves, and 1% are organic acid. 

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

There are 128,373 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 30,370 with ISO9001, 18,546 with Other, and 5,076 with ISO14001 certification.