mc_rebalance/data/tetra/modules/double/binding.json

{
    "variants": [
        {
            "materials": [ "tetra:fibre/", "tetra:skin/" ],
            "key": "double_binding/",
            "extract": {
                "availableTextures": [ "default", "tconstruct" ],
                "models": [ { "location": "tetra:item/module/double/binding/binding/" } ]
            }
        }
    ]
}