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About product and suppliers:
        Alibaba.com offers 229 dark competence products. such as free samples. 

There are 150 dark competence suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Vietnam, which supply 87%, 11%, and 1% of dark competence respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 111 with Other, 7 with ISO9001, and 1 with ISO13485 certification.