Annual output 2000tons professional manufacturer; Certificate: TS16949,ISO9001:2008;SGS ... order to protect the surface,we have lots of surface treament ,like Nickel,Nickel-Copper-Nickel,Znic ... Hcj.The temperature coefficients -0.09--0.13% of Br,and -0.5--0.8%/degree C of Hcj.Sintered NdFeB magnet offers ... able to control the magnetic properties within the range as you demanded,like SHT,UHT,L-SHT ...