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Wukong Magnetic Grade N42 Rectangular Bar Neodymium Magnets. We never compromise on quality and all our products are performance tested using a computer controlled tensile and compression machine. The system accurately measures the weight a magnet can hold when pulled vertically and the amount of pull a magnet can exert when there is a gap or non-magnetic material between the magnet and the material it is applied to attract. China produces approx. 97% of the world's neodymium magnet supply. We evaluated about a dozen different Chinese producers, reviewed their price/performance ratios and we think this Round Neodymium Magnet is the best one. Feature: *They are made from Neodymium (Nd), Iron (Fe) and Boron (B) material and plated in Ni+Cu+Ni for a shiny surface and good corrosion resistant finish. *They are brittle and hard since have powerful magnetic. So Pls don't violent hit it, they will use a very long time. *Maximum working temperature is 176 F (80 C). *They can attract each other through the thickness up to 2.5 cm (0.98 in) of the solid wood. *Every rectangular magnet can support 33lbs pull. *They don't affect most of the electric device. What is in box. 10 X Rectangular Bar Neodymium Magnets Within 30 days Our Guarantee to You: - If you're not 100% satisfied with our product, ship it back and we will refund your money. - If the product breaks or is damaged, ship it back and we will replace it for FREE. Notes: Pls Keep away from kids and aovid violent hit If you are interested in this product or have any questions please contact with us ★★★Noted: If you receive the disc magnets has any question, pls contact with us. and we will solve your problem. Until you are satisfied.