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About product and suppliers:
        Alibaba.com offers 2,993 switching layer 1 products. such as plastic, pvc. You can also choose from free samples, paid samples. 

There are 2,992 switching layer 1 suppliers, mainly located in Asia. The top supplying countries or regions are China, Argentina, and Hong Kong S.A.R., which supply 99%, 1%, and 1% of switching layer 1 respectively. 

Switching layer 1 products are most popular in Mid East, Southeast Asia, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 585 with ISO9001, 296 with Other, and 85 with ISO14001 certification.