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About product and suppliers:
        Alibaba.com offers 15,909 4mm lead products. About 1% of these are medical-ray protective products, 1% are lead, and 1% are medical x-ray equipments & accessories. 

A wide variety of 4mm lead options are available to you, such as lead bar, lead pipe, and lead sheet. You can also choose from not powder, is powder. As well as from non-alloy, is alloy. And whether 4mm lead is equal, or round. 

There are 15,874 4mm lead suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, which supply 91%, 6%, and 1% of 4mm lead respectively. 

mm lead products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 3,953 with ISO9001, 1,767 with Other, and 1,663 with ISO14001 certification.