... prducts,unbeatable pruce The product is a CO2 gas shielded welding ,which is made of excellent steel by drawing,straightening and ... copper coating,it has characteristic such as open arc,slag-free,good weld ability.high efficiency. Beautiful bead.litter ... ,NK.Specification:ER70S-3ER70S-4ER70S-6ER70S-7 CO2 GAS SHIELDED WELDING WIRE