Sphere Shaped Nickel Plated Magnets ; Size: OD 5mm :216 Pieces ; Features: Max operating temp : 80°C ; Grade: N35 ; Coating: Nickel -Ni; Directions of Magnetization :Top - North Pole / Bottom - South Pole and Thickness Magnetized. Nickel Coated Magnets have many industrial, educational and household uses.It is best to Nickel coated for long-term maximum energy output and usage. These Magnets are highly resistance against demagnetization.