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Manufactured to strict quality standards and annually tested by an accredited third-party laboratory for reliable performance Made of copper sheet (purity: ≥99.99%) and conductive copper wires Copper Sheet: 10x15x1 mm each; 5 packs; please connect the copper wire to the electrode sheet by yourself Used as anode, cathode, or auxiliary electrode; compatible with stonylab electrochemical system For custom sizes or items damaged during transit, please contact us for assistance