diff --git a/nhf/touhou/shiki_eiki/rod.py b/nhf/touhou/shiki_eiki/rod.py
index b53141d..fc2c541 100644
--- a/nhf/touhou/shiki_eiki/rod.py
+++ b/nhf/touhou/shiki_eiki/rod.py
@@ -7,16 +7,21 @@ import nhf.utils
 @dataclass
 class Rod(Model):
 
+    width: float = 120.0
+    length: float = 550.0
+    length_tip: float = 100.0
+    width_tail: float = 60.0
+
     @target(name="surface")
     def top_profile(self) -> Cq.Sketch:
-        w, h = 10, 20
         sketch = (
             Cq.Sketch()
             .polygon([
-                (w, h),
-                (w, -h),
-                (-w, -h),
-                (-w, h),
+                (self.length, 0),
+                (self.length - self.length_tip, self.width/2),
+                (0, self.width_tail / 2),
+                (0, -self.width_tail / 2),
+                (self.length - self.length_tip, -self.width/2),
             ])
         )
         return sketch