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.

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import crafttweaker.api.item.type.armor.ArmorMaterials;

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

• ArmorMaterial

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

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<constant:minecraft:armor/materials:leather>
<constant:minecraft:armor/materials:chain>
<constant:minecraft:armor/materials:iron>
<constant:minecraft:armor/materials:gold>
<constant:minecraft:armor/materials:diamond>
<constant:minecraft:armor/materials:turtle>
<constant:minecraft:armor/materials:netherite>