Specification:

Size: Ring 40-22x7 N30
Outer Dia: 40 mm
Inner Dia: 22 mm
Thickness: 7 mm 
Grade: N30
Coating: Nickle - Ni  
Max Operating Temperature: 80°C   

Description:
Nickel Coated Magnets have many industrial, educational and household uses. These Magnets are highly resistant against demagnetization.