It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.item.type.armor.ArmorItem;

ArmorItem extends ItemDefinition. That means all methods available in ItemDefinition are also available in ArmorItem

ArmorItem implements the following interfaces. That means all methods defined in these interfaces are also available in ArmorItem

• Equipable

Name	Type	Has Getter	Has Setter
Name defense	Type int	Has Getter true	Has Setter false
Name equipSound	Type SoundEvent?	Has Getter true	Has Setter false
Name equipmentSlot	Type EquipmentSlot	Has Getter true	Has Setter false
Name material	Type ArmorMaterial	Has Getter true	Has Setter false
Name toughness	Type float	Has Getter true	Has Setter false