diff --git a/fbchat/_client.py b/fbchat/_client.py
index a74a3b5..4f6e5a9 100644
--- a/fbchat/_client.py
+++ b/fbchat/_client.py
@@ -70,6 +70,9 @@ class Client:
         self._session = session
         self._uid = session.user_id
 
+    def __repr__(self):
+        return "Client(session={!r})".format(self._session)
+
     """
     INTERNAL REQUEST METHODS
     """
diff --git a/fbchat/_session.py b/fbchat/_session.py
index 7222d7b..581813f 100644
--- a/fbchat/_session.py
+++ b/fbchat/_session.py
@@ -5,7 +5,7 @@ import requests
 import random
 import urllib.parse
 
-from ._core import log, attrs_default
+from ._core import log, kw_only
 from . import _graphql, _util, _exception
 
 FB_DTSG_REGEX = re.compile(r'name="fb_dtsg" value="(.*?)"')
@@ -98,7 +98,7 @@ def _2fa_helper(session, code, r):
     return r
 
 
-@attrs_default
+@attr.s(slots=True, kw_only=kw_only, repr=False)
 class Session:
     """Stores and manages state required for most Facebook requests.
 
@@ -118,6 +118,10 @@ class Session:
         """The logged in user's ID."""
         return self._user_id
 
+    def __repr__(self):
+        # An alternative repr, to illustrate that you can't create the class directly
+        return "<fbchat.Session user_id={}>".format(self._user_id)
+
     def _get_params(self):
         self._counter += 1  # TODO: Make this operation atomic / thread-safe
         return {