Magnetic Sphere, ball magnet, permanent magnet, strong magnet, neodymium magnet, used for Magnetic Toy and Jewelry, Magnetic Health Product etc. Material: neodymium magnet, have strong magnetic strength Grade: from N35 to N45 Coating: Ni, Chrome, and other coating Size: Diameter: 5, 8, 10, 12, 15, 19, and 22mm Customized sizes and coating are welcome