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About product and suppliers:
        Alibaba.com offers 511,057 card usb products. About 5% of these are usb flash drives, 1% are data cables, and 1% are computer cables & connectors. 

A wide variety of card usb options are available to you, such as 3000-4000(mah), 16gb, and 64gb. You can also choose from free samples, paid samples. 

There are 508,277 card usb suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, which supply 99%, 1%, and 1% of card usb respectively. 

Card usb products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 69,040 with ISO9001, 58,976 with Other, and 12,995 with ISO14001 certification.