... ballShape: Arc(segment), Block, Cube, Cylinder, Disc, Ring, Rod, SphereMaterial grade or magnetic propertes for sintered magnet:Normalgrade:N35~N50,N35M ... ,N33H~N45H,N30SH~N42SH,N30UH~N35UH,N28EH~N35EH, N30AH~N33AHHigh grade: N38UH, N30AH, N33AHCoating: Zn, Ni, NiCuNi, Au, PassivationWe are professional ...