Feature: -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.