diff --git a/DrawingArtillery.java b/DrawingArtillery.java
index 2b64328..2ea1b66 100644
--- a/DrawingArtillery.java
+++ b/DrawingArtillery.java
@@ -2,7 +2,7 @@ import java.awt.*;
 
 public class DrawingArtillery {
     protected EntityArtillery artillery;
-    protected DrawingRollers drawingRollers;
+    protected IDrawingRollers drawingRollers;
     protected float _startPosX;
     protected float _startPosY;
     private Integer _pictureWidth = null;
diff --git a/DrawingRollers.java b/DrawingRollers.java
index d12eafd..0c68703 100644
--- a/DrawingRollers.java
+++ b/DrawingRollers.java
@@ -1,6 +1,6 @@
 import java.awt.*;
 
-public class DrawingRollers {
+public class DrawingRollers implements IDrawingRollers {
     private RollersCount rollersCount;
     private Color color;
 
diff --git a/IDrawingRollers.java b/IDrawingRollers.java
new file mode 100644
index 0000000..a8fbe42
--- /dev/null
+++ b/IDrawingRollers.java
@@ -0,0 +1,6 @@
+import java.awt.*;
+
+public interface IDrawingRollers {
+    void setRollersCount(int num);
+    void draw(Graphics2D g, int x, int y, int artilleryWidth, int artilleryHeight);
+}