2. RFID Blocking, Cell Signal Blocking, WIFI Blocking Nickel/ Copper Fabric. 40" x 40"(Click Link to Check Price on Amazon) Editor's Rating : 8.8 out of 10 REDUCE THE HARMFUL EFFECTS OF RADIATION. This is a Nickel Copper blend that prevents most wifi, cell signal. and radiation from going through. The only way to eliminate it is to completely wrap yourself or the device, but if you lay it underneath your laptop or around the front of your computer tower you can redirect the radiation away from you.100% SATISFACTION GUARANTEED! If you are not completely satisfied that this product is working for you and your family RETURN IT ANYTIME!