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About product and suppliers:
        Alibaba.com offers 135,310 stem products. About 2% of these are single spices & herbs, 2% are other toys & hobbies, and 1% are bicycle stem. 

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

There are 132,104 stem suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 93%, 2%, 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 24,994 with ISO9001, 20,816 with Other, and 3,818 with ISO14001 certification.