AOMAG Strong Neodymium Stainless Fishing Magnets, 148 LBS (67 KG) Pulling Force Rare Earth Magnet with Hook Diameter 1.89 inch (48 mm) for Retrieving in River and Magnetic Fishing 100% Brand New By AOMAG. (http://www.aomagnet.com) Top Quality Neodymium Iron Boron (NDFeB) Rare Earth Magnets Theory of vertical force:148 Pounds (67kg), The theoretical level of tension:15 Pounds (6.0kg) These are very strong magnets with high pulling force, even the size is not so "big". The magnets may cause hurt when two magnets come together. These are NOT toy magnets, please keep them away from children. Grade N52 is the highest grade (the most powerful magnet) that human tec. can reach so far. We at aomagnet guaranty that every piece of magnet we supply is in accordance with TS16949 and ISO14001. Working temperature: 175F (80) Quantity: 1 Rare Earth Magnet Hook per package