... machining techniques Speaker Ring ferrite magnet: Ferrite magnet is sintered permanent magnet composed of barium or strontium ferrite.This class ... demagnetization, has the popular advantage of low cost. Ferrite magnets are very hard and brittle, and require specialized machining ... any direction. Have grade Y25,Y30, Y30BH ,Y35.Ferrite magnets are available in varieties of shapes and sizes, including ...