diff --git a/src/main/java/gregtech/common/blocks/GT_Material_Casings.java b/src/main/java/gregtech/common/blocks/GT_Material_Casings.java
index 211fbdd6..94afcbd8 100644
--- a/src/main/java/gregtech/common/blocks/GT_Material_Casings.java
+++ b/src/main/java/gregtech/common/blocks/GT_Material_Casings.java
@@ -13,6 +13,6 @@ public class GT_Material_Casings
     }
 
     public boolean isOpaque() {
-        return false;
+        return true;
     }
 }
diff --git a/src/main/java/gregtech/common/blocks/GT_Material_Reinforced.java b/src/main/java/gregtech/common/blocks/GT_Material_Reinforced.java
index a6cf425c..4aa9ba69 100644
--- a/src/main/java/gregtech/common/blocks/GT_Material_Reinforced.java
+++ b/src/main/java/gregtech/common/blocks/GT_Material_Reinforced.java
@@ -12,6 +12,6 @@ public class GT_Material_Reinforced
     }
 
     public boolean isOpaque() {
-        return false;
+        return true;
     }
 }