These 3mil transparent metallic static shielding bags are perfect for protecting highly-sensitive components such as electronics from static damage. They guard against static charges from both inside and outside with its three layers of anti-static protection. These zip lock bags offer Faraday Cage protection and with up to 50% transparency for easy product visibility. Each bag has a static shielding notice which has been stamped in yellow. The 3 mil thickness means they are thick enough to resist tears and punctures which gives you the extra protection you need for your electronics. There are 100 static shielding reclosable zip lock bags in each case. These bags meet the electrical and physical requirements of ANSI/ESD S541, EIA 625 and are ANSI/ESD S20.20 program compliant. Rest assure, these bags will protect your electronic components and parts during packaging, transmission and storage.