... )Grade: Y20,Y25,Y30,Y30BH,Y35,etc b)Shape: Block c)Size: D3-280mm d)Coating: Zn,Ni,Gold,Epoxy,etc Ferrite ... Magneta)Grade: Y20,Y25,Y30,Y30BH,Y35,etcb)Shape: Blockc)Size: D3-280mmd)Coating: Zn,Ni,Gold,Epoxy,etcpermanent magnet/ferrite ... ,Y30,Y30BH,Y35,etc. with many style are available.The size could be producted according to your requirement.