Revitalizaire 1/8 Inch Thick N42 Neodymium Disc Magnets 1.3 Inch Diameter 10-Pack. Powerful NdFeB Rare Earth Magnets Coated with Thick Nickel and Copper Plating. Silver Color Magic Tricks Levitation Machines Magnet Therapy Key holder Magnetic clamp Securing tarps or car covers Preventing water heater corrosion