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.armor.ArmorMaterial;

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

• IArmorMaterial

ArmorMaterial is an enum. It has 7 enum constants. They are accessible using the code below.

ZenScript
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ArmorMaterial.LEATHER
ArmorMaterial.CHAIN
ArmorMaterial.IRON
ArmorMaterial.GOLD
ArmorMaterial.DIAMOND
ArmorMaterial.TURTLE
ArmorMaterial.NETHERITE