- New shielding material: The emf faraday cloth is made from 20% copper nickel and 80% polyester, excelling at effectively blocking a wide range of signals. Shielding efficiency reaches 80-90 dB, with a shielding rating from 10 kHz to 30 GHz, blocking 99.99% of wireless frequencies. The anti-friction capability can reach 5,000,000 cycles. - 99.99% upgrade protective: Faraday fabric is highly electrically conductive, providing RF/EMI/EMF/IF blocking. The fabric has been upgraded with a double layer copper layer and reduced polyester fiber to deliver stronger protection, achieving up to 99.99% protection. This effectively blocks WIFI, Bluetooth, GPS, and RFID. - Large size for crafting: Copper nickel Faraday fabric is easy to cut and sew, suitable for making bags, car key and router bags, curtains, tents, and more. It provides effective shielding for cell towers, microwave signals, phones, smart meters, security systems, radar, and military broadcasts. It can be used as an insert in a wallet or handbag to protect your credit cards from data theft. - Extensive coverage: The fabric offers excellent protection against electromagnetic radiation from transmission towers, communication base stations, WiMAX base stations, WiFi base stations, and other 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.