1) material performance
Higher Magnet stability and stronger magnet penetration depth
High ability against demagnetization
Wide grades: From N35 to N52;33M to 50M;35H to 48H; 33SH to 45SH;28UH to 40UH;28EH to 38EH
Sizes: according to your requirements
2) coating
Ni, NiCuNi, Zn, White-blue Zn, Expoy, Gold, and etc.