diff --git a/suitablephones/models.py b/suitablephones/models.py
index 965f844..db0d388 100644
--- a/suitablephones/models.py
+++ b/suitablephones/models.py
@@ -20,7 +20,7 @@ class Camera(models.Model):
     info = models.CharField(max_length=100, null=True)
 
     def __str__(self):
-        return f" {self.flash} - {str(self.megapixel)} - {self.info}"
+        return f"{self.flash} - {str(self.megapixel)} - {self.info}"
                
 class Screen(models.Model):
     size = models.CharField(max_length=500, null=True)
@@ -31,7 +31,7 @@ class Screen(models.Model):
     technology = models.CharField(max_length=100)
     
     def __str__(self):
-        return f"{self.size_in} - {self.density} - {self.technology}"
+        return f"{str(self.size_in)} - {str(self.density)} - {str(self.technology)}"
                   
 class Device(models.Model):
     #architecture  =  models.JSONField(default=dict)