... 3.Zn,Ni coated 4.Do as the drawings speaker disc magnetsProduct Image1.Material: neodymium magnet2.Grade: N35-N52, N30M-N50M ... -N40UH, N28EH-N38EH3.Shapes and sizes: Various such as block, disc, cylinder, ring, ball, arc, segment, can custom magnet as per ... or by express(UPS,DHL,TNT and FedeX,etc) speaker disc magnets