1. Shielding MaterialThe emf faraday cloth is made from 20% copper nickle 80% polyester excels at effectively blocking a wide range of signals, which has better shielding function and good conductivity, shielding efficiency reaches 80 90dB, shielding rating from 10khz to 30ghz. blocking 99.99% of wireless frequencies. The number of anti friction can reach 5,000,000 times. 2.99.99% Upgrade ProtectiveFaraday fabric is made of polyester, copper and nickel, highly electrically conductive, RF/EMI/EMF/IF blocking. Fabric has undergone a major upgrade by adding a double layer copper layer and reduce the polyester fiber, thereby obtaining stronger protection, up to 99.99% protection. Which can effectively blocking WIFI, bluetooth, GPS and RFID. 3.Large Size for CraftingCopper nickel faraday fabric is easy to cut and sew, usage for bags, car keys and router bag, curtains, tents, etc. Effective shielding for celltowers, microwave signals, phones, smart meters, security systems, radar, military broadcast, etc and more. as an insert in the wallet or handbag to protect your credit cards from data theft. 4.Extensive CoverageFabric excellent protection against electromagnetic radiation from various sources, including transmission towers, communication base stations, wimax base stations, WIFI base stations, and wireless transmitting devices. Trusted by law enforcement and the military, it blocks electronic signals, defends against emps, and is ideal for signal proof rooms or tents.