The New NRG Magnetic Oil Drain Plug is embedded with high intensity magnet that catches any ferrous metallic particles in the engine or transmission oil that might be scraped from cylinder walls or gears. This maintains optimum cleanliness in engine oil circulation. The embedded design is to ensure that the magnet will not drop into the engine oil. It is made from 6061 high grade aluminum, 5000 Gauss magnet and anodized finish for extra corrosion resistance. Just wipe it clean and reinstall every change oil to ensure proper performance.