Transparent metalized static-shielding bags provide electromagnetic interference and radio-frequency interference (EMI and RFI) protection Durable, three-layer bags construction with the metal layer sandwiched between polyester and polyethylene Date-coded for quality control traceability and heat-stamped with a yellow ESD (electrostatic discharge) warning Open-top and zip-close models available Meet or exceed electrical and physical requirements of MIL-PRF-81705 Type III and EIA 541