1.Materials: Neodymium-Iron-Boron 2.N35, 1"dia x 1/8" NdFeB Magnet, Ni-Cu-Ni Coating 3.Certificate: ... :N33,N35,N38,N40,N42,N45,N48,N50,N52, (M, H, SH, EH, UH )Coatings: Ni, Ni-Cu-Ni, Zn, white ... ,500 Gs,Hci: 11,000 to 30,000 Oe,BHmax: 35 to 50MGOe )Maximum working temperature: 80 to 200 degrees C ...