Specification:

Size: Ring 18-5x3 N35
Outer Dia: 18 mm
Inner Dia: 5 mm
Thickness:  3 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.