{
    "values": [
        {
            "id": "minecraft:creeper_head",
            "required": false
        },
        {
            "id": "minecraft:dragon_head",
            "required": false
        },
        {
            "id": "minecraft:heavy_core",
            "required": false
        },
        {
            "id": "minecraft:player_head",
            "required": false
        },
        {
            "id": "minecraft:skeleton_skull",
            "required": false
        },
        {
            "id": "minecraft:wither_skeleton_skull",
            "required": false
        },
        {
            "id": "minecraft:zombie_head",
            "required": false
        }
    ]
}