{
    "variants": {
        "": [ { "model": "block/gravel", "weight":600 },
{ "model": "block/gravel1", "weight":200 },
{ "model": "block/gravel2", "weight":400 },
{ "model": "block/gravel3", "weight":300 },
{ "model": "block/gravel4", "weight":300 },
{ "model": "block/gravel5", "weight":600 },
{ "model": "block/gravel6", "weight":600 },
{ "model": "block/gravel7", "weight":1 }

 ]   }
}

