Specification:

Size: Ring  OD16xID3.5x5 mm
Outer Dia: 16 mm
Inner Dia: 3.5 mm
Thickness: 5 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.