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About product and suppliers:
        Alibaba.com offers 15,499 40 inch human hair extensions products. About 99% of these are hair extension, 1% are wigs, and 1% are other artificial hair. 

A wide variety of 40 inch human hair extensions options are available to you, such as free samples, paid samples. 

There are 15,446 40 inch human hair extensions suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Vietnam, which supply 73%, 18%, and 7% of 40 inch human hair extensions respectively. 

0 inch human hair extensions products are most popular in North America, Africa, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 722 with Other, 224 with ISO9001, and 26 with TL9000 certification.