Iron equipment is the next strongest equipment to use after bronze equipment, and requires level 10 Attack to wield weapons and level 10 Defence to wear armour. As with all things iron, the equipment has a dull grey colour.
Iron weapons are stronger than bronze weapons, but weaker than steel weapons. There are no extra requirements to wield an iron weapon other than level 10 Attack. While iron is slightly more expensive than bronze, many low-level players use it often as it is still fairly cheap and the equipment can be created with a fairly low smithing level.