diff --git a/bioexplorer/pythonsdk/bioexplorer/bio_explorer.py b/bioexplorer/pythonsdk/bioexplorer/bio_explorer.py
index 4af81fc1d..658cdfef0 100644
--- a/bioexplorer/pythonsdk/bioexplorer/bio_explorer.py
+++ b/bioexplorer/pythonsdk/bioexplorer/bio_explorer.py
@@ -1713,11 +1713,7 @@ def get_model_bounds(self, model_id):
         min_aabb = Vector3(value[0], value[1], value[2])
         value = model_bounds["maxAABB"]
         max_aabb = Vector3(value[0], value[1], value[2])
-        value = model_bounds["center"]
-        center = Vector3(value[0], value[1], value[2])
-        value = model_bounds["size"]
-        size = Vector3(value[0], value[1], value[2])
-        return Bounds(min_aabb, max_aabb, center, size)
+        return Bounds(min_aabb, max_aabb)
 
     def get_model_ids(self):
         """
diff --git a/bioexplorer/pythonsdk/bioexplorer/math_utils.py b/bioexplorer/pythonsdk/bioexplorer/math_utils.py
index 243799f16..5f421b4b3 100644
--- a/bioexplorer/pythonsdk/bioexplorer/math_utils.py
+++ b/bioexplorer/pythonsdk/bioexplorer/math_utils.py
@@ -175,6 +175,8 @@ def __init__(self, min_aabb, max_aabb):
         assert isinstance(max_aabb, Vector3), "max_aabb must be an instance of Vector3"
         self.min_aabb = min_aabb
         self.max_aabb = max_aabb
+        self.center = Vector3()
+        self.size = Vector3()
         self.update()
 
     def update(self):