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About product and suppliers:
        Alibaba.com offers 11,673 mailing standard products. such as free samples, paid samples. 

There are 11,673 mailing standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of mailing standard respectively. 

Mailing standard products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 2,919 with ISO9001, 1,324 with ISO14001, and 772 with Other certification.