Round copper-coated carbon electrodes 1.Made of high graphite 2.High quality,high purity 3. ... quality-control system.This product is based on graphite,felt by asphalted and modeled with thermal extruding ... application scales,good effects and economical.Instructions:The electrodes must keep in dry environment;if it is ... use.When using for the direct current,the electrodes link to the anode,and task to the ...