diff --git a/src/Studio/Resource/Material.php b/src/Studio/Resource/Material.php
index 1b8e129..b15904f 100644
--- a/src/Studio/Resource/Material.php
+++ b/src/Studio/Resource/Material.php
@@ -40,6 +40,11 @@ class Material extends JsonResource
                 'k' => $this->pivot->k,
                 'a' => $this->pivot->a,
             ],
+            // 硬度上下限
+            'hardnessRange' => [
+                'min' => $this->pivot->min_hardness,
+                'max' => $this->pivot->max_hardness,
+            ],
         ];
     }
 }
\ No newline at end of file