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About product and suppliers:
        Alibaba.com offers 496 4th gen products. such as free samples, paid samples. 

There are 496 4th gen suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 4th gen respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 209 with ISO9001, 23 with ISO14001, and 14 with Other certification.