It is made of featuring Magnet, Aluminium Alloy. Not only safe but also good sealing can be used for a long time. Easy to install, direct remove t your old screw and replace the new one directly. This is a non-OEM product, accessory only! This magnetic drain plug is to keep harmful metal fragments out of your engine. When time goes by, your engine components would wear down and they will start to release metal fragments into your engine oil. These plugs have a magnetism to gather the debris from oil during operation. When you change oil, you just need to clean off the end terminal of the magnet and it could be re-used again. Easy installation, matches your original vehicle. Direct replacement for your old or broken one. Please check the size before you place an order!. Make sure these are the correct goods before placing an order to avoid causing you unnecessary loss. If you are not sure whether it is suitable or not, please contact us and attach your vehicle information before purchasing.