diff --git a/plstackapi/core/models/slice.py b/plstackapi/core/models/slice.py
index 5a5f165..16a2c27 100644
--- a/plstackapi/core/models/slice.py
+++ b/plstackapi/core/models/slice.py
@@ -21,6 +21,10 @@
     network_id = models.CharField(max_length=256, help_text="Quantum network")
     router_id = models.CharField(max_length=256, help_text="Quantum router id")
 
+    SVC_CLASS_CHOICES = (('besteffort', 'Best Effort'), ('silver', 'Silver'), ('gold','Gold'))
+    serviceClass = models.CharField(verbose_name="Service Class",default="besteffort",help_text="The Service Class of this slice", max_length=30, choices=SVC_CLASS_CHOICES)
+
+
     def __unicode__(self):  return u'%s' % (self.name)
 
     def save(self, *args, **kwds):
diff --git a/plstackapi/core/models/sliver.py b/plstackapi/core/models/sliver.py
index 13f94b2..529c131 100644
--- a/plstackapi/core/models/sliver.py
+++ b/plstackapi/core/models/sliver.py
@@ -21,6 +21,8 @@
     slice = models.ForeignKey(Slice, related_name='slivers')
     node = models.ForeignKey(Node, related_name='slivers')
     deploymentNetwork = models.ForeignKey(DeploymentNetwork, verbose_name='deployment', related_name='sliver_deploymentNetwork')
+    numberCores = models.IntegerField(verbose_name="Number of Cores", help_text="Number of cores for sliver", default=2)
+
 
     def __unicode__(self):  return u'%s::%s' % (self.slice, self.deploymentNetwork)