diff --git a/src/layout/primitive.rs b/src/layout/primitive.rs
index 45ab70d..a54ed24 100644
--- a/src/layout/primitive.rs
+++ b/src/layout/primitive.rs
@@ -229,10 +229,13 @@ where
     }
 }
 
-impl<'a, W, R: RulesTrait> GetConditions for GenericPrimitive<'a, W, R> {
+impl<'a, W, R: RulesTrait> GetConditions for GenericPrimitive<'a, W, R>
+where
+    GenericPrimitive<'a, W, R>: GetNet,
+{
     fn conditions(&self) -> Conditions {
         Conditions {
-            netclass: Some("NETCLASS_A".to_string()),
+            net: self.net(),
             region: Some("A".to_string()),
             layer: Some("F.Cu".to_string()),
         }
diff --git a/src/layout/rules.rs b/src/layout/rules.rs
index fab75f5..7a657af 100644
--- a/src/layout/rules.rs
+++ b/src/layout/rules.rs
@@ -9,7 +9,7 @@ pub trait GetConditions {
 
 #[derive(Debug, Default)]
 pub struct Conditions {
-    pub netclass: Option<String>,
+    pub net: i64,
     pub region: Option<String>,
     pub layer: Option<String>,
 }
diff --git a/src/main.rs b/src/main.rs
index c8c9801..4da12e0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,21 +59,15 @@ use crate::math::Circle;
 use crate::router::Router;
 
 struct SimpleRules {
-    netclass_clearances: HashMap<(String, String), f64>,
+    net_clearances: HashMap<(i64, i64), f64>,
 }
 
 impl RulesTrait for SimpleRules {
     fn clearance(&self, conditions1: &Conditions, conditions2: &Conditions) -> f64 {
-        if let (Some(ref netclass1), Some(ref netclass2)) =
-            (conditions1.netclass.clone(), conditions2.netclass.clone())
-        {
-            *self
-                .netclass_clearances
-                .get(&(netclass1.to_string(), netclass2.to_string()))
-                .unwrap_or(&10.0)
-        } else {
-            5.0
-        }
+        *self
+            .net_clearances
+            .get(&(conditions1.net, conditions2.net))
+            .unwrap_or(&10.0)
     }
 
     /*fn clearance_limit(
@@ -248,19 +242,13 @@ fn main() -> Result<(), anyhow::Error> {
     let mut event_pump = sdl_context.event_pump().unwrap();
     let _i = 0;
     let mut router = Router::new(SimpleRules {
-        netclass_clearances: HashMap::from([
-            (
-                (String::from("NETCLASS_A"), String::from("NETCLASS_A")),
-                5.0,
-            ),
-            (
-                (String::from("NETCLASS_A"), String::from("NETCLASS_B")),
-                10.0,
-            ),
-            (
-                (String::from("NETCLASS_B"), String::from("NETCLASS_A")),
-                10.0,
-            ),
+        net_clearances: HashMap::from([
+            ((1, 2), 5.0),
+            ((2, 1), 5.0),
+            ((2, 3), 10.0),
+            ((3, 2), 10.0),
+            ((3, 4), 15.0),
+            ((4, 3), 15.0),
         ]),
     });