Magnetic Shielding is an alloy containing approximately 80% nickel (Ni). Nickel has magnetic and magnetostrictive properties. In the soft or annealed state, the molecules in nickel will absorb magnetism much like a sponge absorb water --- restricting the flow and allowing no specific pattern to emerge.
Use this .005” x 5” x 12” metal strip to shield the precision PAI-700 compass from magnetic interference in the instrument panel.