1].Neodymium magnet, 2].with special size, 3].Zinc coating 4].Short lead time & reasonalbe price 5 ... free to send us enquiry ! With various type of Size and shaped Shaped: Ring, Round, Rectangle , or ... any other OEM size Size : up to you , in mm or inchCoating: Ni ... motors, loud speakers, MRI, medical apparatus, transmission machine,etc.Material Characteristics