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- These are the most powerful permanent magnets currently manufactured, and do not lose their magnetization even when approaching other magnets ! They are extremely powerful and are designed for many uses. These bar magnets are 2.36 inch (60mm) long, 0.40 inch (10mm) wide and 0.1 inch (3mm) thick. They are composed of neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Maximum working temperature is 176 F (80 C). - Our neodymium magnets provide an astonishing pull of 15lb and every magnet has a triple coating of nickel & copper to prevent against corrosion. Widely used for home improvement, theater design, industrial equipment, electronics, automotive, arts & crafts, Science Projects etc.