Dear Sir/Madam, Type:Permanent Composite:NdFeB Magnet Shape:sphere Item Name:Neodymium sphere magnet Material:Neodymium Iron Boron Grade BH:N40-N42 (NM-EH ) Size:10mm-20mm Tolerance:+/- 0.05mm Magnetism direction:Thickness, Axial, Radial, Diametrically, Multi-poles Coating:Nickel-plated (Ni-Cu-Ni-Au),Zn,Expoy,Sliver,others Leading Time:7-25 days Sample:Avaliable Shipping:By air Show More