Faraday Cage effect shields electronic components from damage due to static discharge Transparent metal bags are printed with ESD warning symbol and date coded for QC traceability. Four layer construction for puncture and tear resistance. Meets EIA 625, MIL-HDBK-263, MIL-STD-1686 and EOS/ESD standards. 3M Open End Static Shielding Bags 14in. x 30in. Made by 3M.