diff --git a/Unity/Materials/Black.mat b/Unity/Materials/Black.mat
new file mode 100644
index 0000000..2cc1dc8
--- /dev/null
+++ b/Unity/Materials/Black.mat
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diff --git a/Unity/Materials/Gray.mat b/Unity/Materials/Gray.mat
new file mode 100644
index 0000000..fbe7287
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+++ b/Unity/Materials/Gray.mat
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diff --git a/Unity/Materials/Orange.mat b/Unity/Materials/Orange.mat
new file mode 100644
index 0000000..189b85b
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+++ b/Unity/Materials/Orange.mat
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diff --git a/Unity/Resources/DifferentialDrive.prefab b/Unity/Resources/DifferentialDrive.prefab
index 74de13f..e4483de 100644
--- a/Unity/Resources/DifferentialDrive.prefab
+++ b/Unity/Resources/DifferentialDrive.prefab
@@ -62,7 +62,7 @@ MeshRenderer:
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@@ -370,7 +370,7 @@ MeshRenderer:
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@@ -522,7 +522,7 @@ MeshRenderer:
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