Specification:

Size: Ring 53-24x11 Fe   
Outer Dia: 53 
Inner Dia: 24
Thickness: 11 mm
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.