A steel case concentrates and focuses the magnetic field. It also protects the magnetic material.

Ceramic magnets resist demagnetization better than other magnets and are an economical choice. They resist temperatures up to 140° F.

A rubber cover protects the mounting surface as well as the magnet.

These ceramic magnets resist demagnetization better than other magnets, and have a metal case to protect the magnetic material. They resist temperatures up to 175° or 245° F.

Parallel poles create a better magnetic hold on thinly painted, plated, or coated flat metal surfaces than other magnets.