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About product and suppliers:
        Alibaba.com offers 1,949 4 oz copper base products. such as free samples, paid samples. 

There are 1,949 4 oz copper base suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 4 oz copper base respectively. 

 oz copper base products are most popular in Western Europe, Northern Europe, and North America. 

You can ensure product safety by selecting from certified suppliers, including 1,497 with ISO9001, 47 with ISO14001, and 7 with ISO/TS16949 certification.