Ring magnet factory in china NdFeb permanent magnet customize The NdFeB magnet can be divided into two kinds, which are neodymium iron boron and sintered NdFeB.The bond is actually the injection molding, and the sintering is the vacuum through the high temperature. The ndfe-boron magnet is the permanent magnet with the strongest magnetic force so far. Specificationï¼? Materialï¼?Sintered Neodymium-Iron-Boron (NdFeB) Shapeï¼?Ring Diameterï¼?2-50mm / Customized Coatingï¼?Ni-Cu-Ni / Nickel /Zn / Gold /Silver/ Epoxy Dimensional Tolerance:+/-0.002 Maximum Operating Temperature:(N35-N52) 80°C (176°F) Magnetization: Thickness Magnetized, Axially Magnetized, Diametrally Magnetized, Multi-poles magnetized, Radial Magnetized. Certifications: SGS, ROHS Packaging:Anti-magnetized carton