Magnetico Pads are specifically engineered to deliver a pure negative (-) magnetic field when you are a minimum of 4″ away from the pad. This magnetic field, produced by permanent magnets, is a safe and natural energy source. it uses high-grade, ceramic alloy, permanent magnets, with a gauss rating of 3 950 gauss at the core. I have used the 10 gauss for the past 10 years. An indispensable part of my biohack gear.