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magnetic cube: Material:Sintered Neodymium Iron Boron(Permanent Rare Earth Magnet) Neodymium Iron Boron (NdFeb) Magnet spheres make a fun puzzle.These 216 rare earth magnet balls will provide you hours of enjoyment. Simple yet addictive.These magnet can also be used on the Refrigerator,white boards,or make desk art to impress your co-workers. Grade:N35/N38magic neo magnetic cube features: 1.Magnetic Therapy:Produce calmness and peace of mind,relieve fatigue 3.Integrate Health Care and develop intelligence. 4.Magnetictoy full of fun.Stimulate your imagnation to create various shapes and patterns. 5.Popular withchildren andadultsgenerally 6.Colors vary owing to different coatings:Au(gloden),Ag(silvery),Ni-Cu-Ni(bright white),Nickle(black) or other coating according to your demand 7.Size:D4.76,D5,D6,D8,D9 etc.of magnetic ball for you to choose from 8.Price depend on the size,coating you need Note:Please keep them away from pets.