diff --git a/src/entity/item/tech.rs b/src/entity/item/tech.rs
index 8976904..b7faeaa 100644
--- a/src/entity/item/tech.rs
+++ b/src/entity/item/tech.rs
@@ -25,7 +25,7 @@ pub enum Technique {
 }
 
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct TechniqueDisk {
     pub tech: Technique,
     pub level: u32,
diff --git a/src/entity/item/tool.rs b/src/entity/item/tool.rs
index 3583a63..dbde12b 100644
--- a/src/entity/item/tool.rs
+++ b/src/entity/item/tool.rs
@@ -394,7 +394,7 @@ impl ToolType {
 }
 
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub struct Tool {
     pub tool: ToolType,
 }