Faraday Defense RFID Shielding Nickel Copper Rip-Stop Fabric Roll 50" x 1' Signal EMF Blocking Material High Performance Copper Nickel Anti-Rip Rip-Stop Shielding Fabric &gt;55db attenuation in 10MHz-3GHz Excellent Radiation, EMF Wave Blocking 50" Width x 1ft Length .09mm (3.5 mil) Thickness