diff --git a/Scripts/Format/VRMExporSettings.cs b/Scripts/Format/VRMExporSettings.cs
index 21202ae60..2ac934a6c 100644
--- a/Scripts/Format/VRMExporSettings.cs
+++ b/Scripts/Format/VRMExporSettings.cs
@@ -139,8 +139,13 @@ namespace VRM
 
                 foreach (var src in go.transform.Traverse().SelectMany(x => x.GetComponents<VRMSpringBone>()))
                 {
+                    // Copy VRMSprngBone
                     var dst = dstSecondary.gameObject.AddComponent<VRMSpringBone>();
                     dst.m_comment = src.m_comment;
+                    dst.m_stiffnessForce = src.m_stiffnessForce;
+                    dst.m_gravityPower = src.m_gravityPower;
+                    dst.m_gravityDir = src.m_gravityDir;
+                    dst.m_dragForce = src.m_dragForce;
                     dst.RootBones = src.RootBones.Select(x => map[x]).ToList();
                     if (src.ColliderGroups != null)
                     {