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About product and suppliers:
        Alibaba.com offers 429,310 sm products. About 13% of these are fiber optic equipment. 

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

There are 425,602 sm suppliers, mainly located in Asia. The top supplying countries or regions are China, Pakistan, and India, which supply 96%, 1%, and 1% of sm respectively. 

Sm products are most popular in North America, South America, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 234,749 with ISO9001, 60,443 with Other, and 11,317 with ISO14001 certification.