... delivery. 3.quality according to ISO9001:2000,TS16949,RoHS ferrite magnetic materials1.great for DC motor,auto application such as starter ... ,Y32,Y33,Y34,Y35,Y36,Y38,Y403.addition:Ca,Sr,Si.Al,rare-earth metal.4.Shape:arc,block5.custom design ... .c.Any questions pls feel free to contact us. ferrite magnetic materials