diff --git a/hypervehicle/hangar/x43.py b/hypervehicle/hangar/x43.py
index 30e10e7..c9719d5 100644
--- a/hypervehicle/hangar/x43.py
+++ b/hypervehicle/hangar/x43.py
@@ -364,10 +364,10 @@ def fin_offset_function2(x, y, z):
 
     # Assess inertial properties
     densities = {
-        "wing_1": 1680,
-        "wing_2": 5590,
-        "wing_3": 1680,
-        "fin_1": 5590,
-        "fin_2": 5590,
+        "body": 1680,
+        "wing": 5590,
+        "inlet": 1680,
+        "fin1": 5590,
+        "fin2": 5590,
     }
     volume, mass, cog, inertia = x43.analyse(densities)