diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTByte.java b/src/main/java/com/io/yutian/aulib/nbt/NBTByte.java
index 4f14919..61f0b6c 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTByte.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTByte.java
@@ -57,6 +57,20 @@ public class NBTByte extends NBTNumber {
         return var0 ? new NBTByte((byte) 1) : new NBTByte((byte) 0);
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTByte nbtByte = (NBTByte) o;
+        return value == nbtByte.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return value;
+    }
+
     @Override
     public String toString() {
         return "NBTByte{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTByteArray.java b/src/main/java/com/io/yutian/aulib/nbt/NBTByteArray.java
index a61c438..d1b5b4d 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTByteArray.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTByteArray.java
@@ -26,6 +26,20 @@ public class NBTByteArray implements INBT {
         return TYPE_ID;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTByteArray that = (NBTByteArray) o;
+        return Arrays.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(value);
+    }
+
     @Override
     public String toString() {
         return "NBTByteArray{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTCompound.java b/src/main/java/com/io/yutian/aulib/nbt/NBTCompound.java
index a6e62b8..48d3ffe 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTCompound.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTCompound.java
@@ -1,9 +1,6 @@
 package com.io.yutian.aulib.nbt;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Set;
-import java.util.UUID;
+import java.util.*;
 
 public class NBTCompound implements INBT {
 
@@ -222,6 +219,20 @@ public class NBTCompound implements INBT {
         return TYPE_ID;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTCompound that = (NBTCompound) o;
+        return Objects.equals(nbtMap, that.nbtMap);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(nbtMap);
+    }
+
     @Override
     public String toString() {
         return "NBTCompound{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTDouble.java b/src/main/java/com/io/yutian/aulib/nbt/NBTDouble.java
index 9edc6ad..8357608 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTDouble.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTDouble.java
@@ -53,6 +53,20 @@ public class NBTDouble extends NBTNumber {
         return (float) this.value;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTDouble nbtDouble = (NBTDouble) o;
+        return Double.compare(value, nbtDouble.value) == 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Double.hashCode(value);
+    }
+
     @Override
     public String toString() {
         return "NBTDouble{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTFloat.java b/src/main/java/com/io/yutian/aulib/nbt/NBTFloat.java
index cba626a..81aba44 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTFloat.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTFloat.java
@@ -50,6 +50,20 @@ public class NBTFloat extends NBTNumber {
         return this.value;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTFloat nbtFloat = (NBTFloat) o;
+        return Float.compare(value, nbtFloat.value) == 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Float.hashCode(value);
+    }
+
     @Override
     public String toString() {
         return "NBTFloat{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTInt.java b/src/main/java/com/io/yutian/aulib/nbt/NBTInt.java
index 24b77e5..dd0a092 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTInt.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTInt.java
@@ -50,6 +50,20 @@ public class NBTInt extends NBTNumber {
         return this.value;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTInt nbtInt = (NBTInt) o;
+        return value == nbtInt.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return value;
+    }
+
     @Override
     public String toString() {
         return "NBTInt{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTIntArray.java b/src/main/java/com/io/yutian/aulib/nbt/NBTIntArray.java
index e04f2c4..093b4a0 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTIntArray.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTIntArray.java
@@ -1,5 +1,7 @@
 package com.io.yutian.aulib.nbt;
 
+import java.util.Arrays;
+
 public class NBTIntArray implements INBT {
 
     public static byte TYPE_ID = 11;
@@ -24,4 +26,17 @@ public class NBTIntArray implements INBT {
         return TYPE_ID;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTIntArray that = (NBTIntArray) o;
+        return Arrays.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(value);
+    }
 }
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTList.java b/src/main/java/com/io/yutian/aulib/nbt/NBTList.java
index 488513a..4166675 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTList.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTList.java
@@ -2,6 +2,7 @@ package com.io.yutian.aulib.nbt;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 public class NBTList<T extends INBT> implements INBT {
 
@@ -66,6 +67,22 @@ public class NBTList<T extends INBT> implements INBT {
         return type;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTList<?> nbtList = (NBTList<?>) o;
+        return type == nbtList.type && Objects.equals(value, nbtList.value);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = Objects.hashCode(value);
+        result = 31 * result + type;
+        return result;
+    }
+
     @Override
     public String toString() {
         return "NBTList{" +
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTLong.java b/src/main/java/com/io/yutian/aulib/nbt/NBTLong.java
index 31c33de..d2d83cd 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTLong.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTLong.java
@@ -59,4 +59,18 @@ public class NBTLong extends NBTNumber {
                 "value=" + value +
                 '}';
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTLong nbtLong = (NBTLong) o;
+        return value == nbtLong.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return Long.hashCode(value);
+    }
 }
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTLongArray.java b/src/main/java/com/io/yutian/aulib/nbt/NBTLongArray.java
index 221ca91..a834945 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTLongArray.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTLongArray.java
@@ -1,5 +1,7 @@
 package com.io.yutian.aulib.nbt;
 
+import java.util.Arrays;
+
 public class NBTLongArray implements INBT {
 
     public static byte TYPE_ID = 12;
@@ -24,4 +26,17 @@ public class NBTLongArray implements INBT {
         return TYPE_ID;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTLongArray that = (NBTLongArray) o;
+        return Arrays.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(value);
+    }
 }
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTShort.java b/src/main/java/com/io/yutian/aulib/nbt/NBTShort.java
index c9e7c53..c77903e 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTShort.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTShort.java
@@ -53,10 +53,25 @@ public class NBTShort extends NBTNumber {
         return this.value;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTShort nbtShort = (NBTShort) o;
+        return value == nbtShort.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return value;
+    }
+
     @Override
     public String toString() {
         return "NBTShort{" +
                 "value=" + value +
                 '}';
     }
+
 }
diff --git a/src/main/java/com/io/yutian/aulib/nbt/NBTString.java b/src/main/java/com/io/yutian/aulib/nbt/NBTString.java
index b20d99d..ed1cd57 100644
--- a/src/main/java/com/io/yutian/aulib/nbt/NBTString.java
+++ b/src/main/java/com/io/yutian/aulib/nbt/NBTString.java
@@ -1,5 +1,7 @@
 package com.io.yutian.aulib.nbt;
 
+import java.util.Objects;
+
 public class NBTString implements INBT {
 
     public static byte TYPE_ID = 8;
@@ -27,6 +29,20 @@ public class NBTString implements INBT {
         return TYPE_ID;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        NBTString nbtString = (NBTString) o;
+        return Objects.equals(value, nbtString.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(value);
+    }
+
     @Override
     public String toString() {
         return "NBTString{" +
diff --git a/src/main/java/com/io/yutian/aulib/serialize/serializers/ItemStackSerializer.java b/src/main/java/com/io/yutian/aulib/serialize/serializers/ItemStackSerializer.java
index a29a288..da16f24 100644
--- a/src/main/java/com/io/yutian/aulib/serialize/serializers/ItemStackSerializer.java
+++ b/src/main/java/com/io/yutian/aulib/serialize/serializers/ItemStackSerializer.java
@@ -16,7 +16,7 @@ public class ItemStackSerializer implements Serializer<ItemStack> {
         jsonObject.put("id", nmsItemStack.c().k().g().a());
         jsonObject.put("Count", nmsItemStack.J());
         NBTTagCompound nbtTagCompound = nmsItemStack.u();
-        jsonObject.put("tag", nbtTagCompound.toString());
+        jsonObject.put("tag", new JSONObject(nbtTagCompound.toString()));
         return jsonObject;
     }
 
@@ -31,7 +31,8 @@ public class ItemStackSerializer implements Serializer<ItemStack> {
             e.printStackTrace();
             return null;
         }
-        return CraftItemStack.asBukkitCopy(net.minecraft.world.item.ItemStack.a(nbtTagCompound));
+        net.minecraft.world.item.ItemStack nmsItemStack = net.minecraft.world.item.ItemStack.a(nbtTagCompound);
+        return CraftItemStack.asCraftMirror(nmsItemStack);
     }
 
 }