Apart from natural resources and ivory, the country manufactured and traded copperware, ferrous metal goods, raffia cloth, and pottery.

Many ferrous metal castings are sized to sharpen corners and flatten holes around piercings.

Induction cooking surfaces work well with any pans with a high ferrous metal content at the base.

Fragmentation mines are generally much larger and heavier than blast mines, and contain a large amount (often several kilograms) of ferrous metal.

Large amounts of ferrous metal combined with the on-and-off electrical fields caused by the vehicle's ignition and charging systems generally result in significant compass errors.