{
    "variants": {
        "normal": [ 
                  { "model": "double_stone" },
                  { "model": "double_stone_1" },
                  { "model": "double_stone_2" },
                  { "model": "double_stone_3" }
                  ],
        "all":    { "model": "double_stone_top" }
    }
}
