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About product and suppliers:
        Alibaba.com offers 125,178 stem products. About 1% of these are bicycle, 1% are other toys & hobbies, and 1% are other bicycle parts. 

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

There are 121,750 stem suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 92%, 3%, and 1% of stem respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 24,068 with ISO9001, 18,962 with Other, and 3,864 with HACCP certification.