1. Military Shielding MaterialCopper nickel is a popular insulative metal due to its high electrical conductivity and effectiveness in signal reduction. Our faraday fabric is made of 20% copper nickel. It has a shielding rating from 10KHz to 30Ghz, surface resistance 0.05Ohm/sq, shielding effectiveness of 80 90dB, operating temperature from 4℃ to 85℃, thickness of 0.08mm, and blocks 99% of wireless frequencies. 2. 99% Blocking EfficiencyMade from a unique blend of metallic copper, metallic nickel, and polyester fibers, faraday fabric effectively blocks electromagnetic fields (EMF) and electromagnetic interference (EMI) to guard you against harmful frequencies. It blocks signals from cellphones, WIFI, Bluetooth, and GPS. It provides anti electrostatic/esd /radiation/microwave shielding. 3. Use for DIY EnclosuresThis shielding nickel copper fabric can be used to line your pockets, make RFID anti theft wallets and wrap your credit cards, line your hat, or make a pouch for your cell phone, smart key, or anything that accepts or transmits these types of signals. 4. Extensive CoverageThe fabric excellent protection against electromagnetic radiation from various sources, including transmission towers, communication base stations, wimax base stations, WIFI base stations, and wireless transmitting devices. It is trusted by law enforcement and the military, blocks electronic signals, defends against emps, and is ideal for signal proof rooms or tents.