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About product and suppliers:
        Alibaba.com offers 3,473 erf products. About 4% of these are diagnostic tools, 3% are truck brake, and 2% are other auto brake system. 

A wide variety of erf options are available to you, such as free samples, paid samples. 

There are 3,375 erf suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Turkey, and Taiwan, which supply 98%, 1%, and 1% of erf respectively. 

Erf products are most popular in South America, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 2,440 with ISO9001, 87 with ISO/TS16949, and 61 with Other certification.