diff --git a/core/assets/arrow0.png b/core/assets/arrow0.png
new file mode 100644
index 0000000..0e49025
Binary files /dev/null and b/core/assets/arrow0.png differ
diff --git a/core/assets/arrow1.png b/core/assets/arrow1.png
index 0e49025..d1aae48 100644
Binary files a/core/assets/arrow1.png and b/core/assets/arrow1.png differ
diff --git a/core/assets/arrow2.png b/core/assets/arrow2.png
deleted file mode 100644
index d1aae48..0000000
Binary files a/core/assets/arrow2.png and /dev/null differ
diff --git a/core/src/sagittarius/model/Arrow.java b/core/src/sagittarius/model/Arrow.java
index 73938ce..e95d383 100644
--- a/core/src/sagittarius/model/Arrow.java
+++ b/core/src/sagittarius/model/Arrow.java
@@ -1,9 +1,5 @@
 package sagittarius.model;
 
-import java.security.PrivilegedExceptionAction;
-import java.util.ArrayList;
-import java.util.Random;
-
 import com.badlogic.gdx.files.FileHandle;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.Pixmap;
@@ -11,6 +7,7 @@ import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.Batch;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.badlogic.gdx.math.Intersector;
+import com.badlogic.gdx.math.MathUtils;
 import com.badlogic.gdx.math.Vector2;
 import com.badlogic.gdx.scenes.scene2d.Actor;
 
@@ -52,8 +49,7 @@ public class Arrow extends EntityQuad {
         this.landed = false;
         
         if (!preview) {
-            Random random = new Random();
-            Pixmap pm = new Pixmap(new FileHandle("core/assets/arrow" + (random.nextInt(2) + 1) + ".png"));
+            Pixmap pm = new Pixmap(new FileHandle("core/assets/arrow" + MathUtils.random(1) + ".png"));
             pm.setBlending(Pixmap.Blending.None);
             for (int x = 0; x < pm.getWidth(); x++) {
                 for (int y = 0; y < pm.getHeight(); y++) {
diff --git a/core/src/sagittarius/model/Planet.java b/core/src/sagittarius/model/Planet.java
index 1883f3e..cced674 100644
--- a/core/src/sagittarius/model/Planet.java
+++ b/core/src/sagittarius/model/Planet.java
@@ -1,7 +1,5 @@
 package sagittarius.model;
 
-import java.util.Random;
-
 import com.badlogic.gdx.files.FileHandle;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.Pixmap;
@@ -22,8 +20,7 @@ public class Planet extends EntityCircle {
     public Planet(Vector2 position, float mass, float radius, Color color) {
         super(0, mass, color, position, radius);
 
-        Random random = new Random();
-        Pixmap pm = new Pixmap(new FileHandle("core/assets/planet" + random.nextInt(5) + ".png"));
+        Pixmap pm = new Pixmap(new FileHandle("core/assets/planet" + MathUtils.random(4) + ".png"));
         
         pm.setBlending(Pixmap.Blending.None);
         for (int x = 0; x < pm.getWidth(); x++) {