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About product and suppliers:
        Alibaba.com offers 51 12x30 cover products. such as free samples. 

There are 44 12x30 cover suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 12x30 cover respectively. 

2x30 cover products are most popular in North America, Eastern Europe, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 51 with ISO9001, 37 with Other certification.