Specification:

Size: Ring 72-32x12 mm Fe   
Outer Dia:7.2cm
Inner Dia:3.2mm
Thickness: 1.2cm
Grade: Y 30
Color: Black
Max Operating Temperature: 300°C   

Description:
Ferrite also is known as Ceramic Magnet is a Composition of iron oxide and barium or strontium carbonate. These materials are readily available and at a lower cost than other types of materials used in the making of Permanent magnets.