Specification:

Size: Ring  40-20x8-N35 Ni
Outer Dia: 40 mm
Inner Dia: 20 mm
Thickness: 8 mm 
Grade: N35
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.