diff --git a/Assets/VRM10_Samples/VRM10Viewer/TinyPbrDescriptorGenerator.cs b/Assets/VRM10_Samples/VRM10Viewer/TinyPbrDescriptorGenerator.cs
index a05a8d58c..7ebc55bfe 100644
--- a/Assets/VRM10_Samples/VRM10Viewer/TinyPbrDescriptorGenerator.cs
+++ b/Assets/VRM10_Samples/VRM10Viewer/TinyPbrDescriptorGenerator.cs
@@ -14,11 +14,11 @@ namespace UniVRM10.VRM10Viewer
         public UrpGltfPbrMaterialImporter PbrMaterialImporter { get; } = new();
         public UrpGltfDefaultMaterialImporter DefaultMaterialImporter { get; } = new();
 
-        public Material CustomMaterial { get; set; }
+        public Material Material { get; set; }
 
-        public TinyPbrDescriptorGenerator(Material customMaterial)
+        public TinyPbrDescriptorGenerator(Material material)
         {
-            CustomMaterial = customMaterial;
+            Material = material;
         }
 
         public MaterialDescriptor Get(GltfData data, int i)
@@ -52,7 +52,7 @@ namespace UniVRM10.VRM10Viewer
             var src = data.GLTF.materials[i];
             matDesc = new MaterialDescriptor(
                 GltfMaterialImportUtils.ImportMaterialName(i, src),
-                CustomMaterial.shader,
+                Material.shader,
                 null,
                 new Dictionary<string, TextureDescriptor>(),
                 new Dictionary<string, float>(),
diff --git a/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity b/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity
index cb53df676..dcd3d9073 100644
--- a/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity
+++ b/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity
@@ -4736,7 +4736,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   _primitiveType: 4
-  _urpMaterial: {fileID: -876546973899608171, guid: ac58f8c11a130e04ba883a82ae4b78e4,
+  _urpMaterialForGrayscale: {fileID: -876546973899608171, guid: ac58f8c11a130e04ba883a82ae4b78e4,
     type: 3}
 --- !u!1 &325720722
 GameObject:
@@ -13432,7 +13432,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   _primitiveType: 0
-  _urpMaterial: {fileID: -876546973899608171, guid: ac58f8c11a130e04ba883a82ae4b78e4,
+  _urpMaterialForGrayscale: {fileID: -876546973899608171, guid: ac58f8c11a130e04ba883a82ae4b78e4,
     type: 3}
 --- !u!1 &806723448
 GameObject: