diff --git a/fbchat/_attachment.py b/fbchat/_attachment.py
index a10c027..847377e 100644
--- a/fbchat/_attachment.py
+++ b/fbchat/_attachment.py
@@ -1,9 +1,9 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from . import _util
 
 
-@attr.s
+@attrs_default
 class Attachment:
     """Represents a Facebook attachment."""
 
@@ -11,12 +11,12 @@ class Attachment:
     uid = attr.ib(None)
 
 
-@attr.s
+@attrs_default
 class UnsentMessage(Attachment):
     """Represents an unsent message attachment."""
 
 
-@attr.s
+@attrs_default
 class ShareAttachment(Attachment):
     """Represents a shared item (e.g. URL) attachment."""
 
diff --git a/fbchat/_core.py b/fbchat/_core.py
index afc90bd..ae7ecb1 100644
--- a/fbchat/_core.py
+++ b/fbchat/_core.py
@@ -4,6 +4,9 @@ import aenum
 
 log = logging.getLogger("fbchat")
 
+#: Default attrs settings for classes
+attrs_default = attr.s(slots=True)  # TODO: Add kw_only=True
+
 
 class Enum(aenum.Enum):
     """Used internally by ``fbchat`` to support enumerations"""
diff --git a/fbchat/_file.py b/fbchat/_file.py
index ef0b8af..9d255cd 100644
--- a/fbchat/_file.py
+++ b/fbchat/_file.py
@@ -1,10 +1,10 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from . import _util
 from ._attachment import Attachment
 
 
-@attr.s
+@attrs_default
 class FileAttachment(Attachment):
     """Represents a file that has been sent as a Facebook attachment."""
 
@@ -28,7 +28,7 @@ class FileAttachment(Attachment):
         )
 
 
-@attr.s
+@attrs_default
 class AudioAttachment(Attachment):
     """Represents an audio file that has been sent as a Facebook attachment."""
 
@@ -51,7 +51,7 @@ class AudioAttachment(Attachment):
         )
 
 
-@attr.s
+@attrs_default
 class ImageAttachment(Attachment):
     """Represents an image that has been sent as a Facebook attachment.
 
@@ -108,7 +108,7 @@ class ImageAttachment(Attachment):
         )
 
 
-@attr.s
+@attrs_default
 class VideoAttachment(Attachment):
     """Represents a video that has been sent as a Facebook attachment."""
 
diff --git a/fbchat/_group.py b/fbchat/_group.py
index c0ef982..bb73b2c 100644
--- a/fbchat/_group.py
+++ b/fbchat/_group.py
@@ -1,10 +1,10 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from . import _util, _plan
 from ._thread import ThreadType, Thread
 
 
-@attr.s
+@attrs_default
 class Group(Thread):
     """Represents a Facebook group. Inherits `Thread`."""
 
diff --git a/fbchat/_location.py b/fbchat/_location.py
index 28f5be7..e94ddb6 100644
--- a/fbchat/_location.py
+++ b/fbchat/_location.py
@@ -1,10 +1,10 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from ._attachment import Attachment
 from . import _util
 
 
-@attr.s
+@attrs_default
 class LocationAttachment(Attachment):
     """Represents a user location.
 
@@ -44,7 +44,7 @@ class LocationAttachment(Attachment):
         )
 
 
-@attr.s
+@attrs_default
 class LiveLocationAttachment(LocationAttachment):
     """Represents a live user location."""
 
diff --git a/fbchat/_message.py b/fbchat/_message.py
index 8546d25..ef0c7c8 100644
--- a/fbchat/_message.py
+++ b/fbchat/_message.py
@@ -1,7 +1,7 @@
 import attr
 import json
 from string import Formatter
-from ._core import log, Enum
+from ._core import log, attrs_default, Enum
 from . import _util, _attachment, _location, _file, _quick_reply, _sticker
 
 
@@ -42,7 +42,7 @@ class MessageReaction(Enum):
     NO = "👎"
 
 
-@attr.s
+@attrs_default
 class Mention:
     """Represents a ``@mention``."""
 
@@ -54,7 +54,7 @@ class Mention:
     length = attr.ib(10)
 
 
-@attr.s
+@attrs_default
 class Message:
     """Represents a Facebook message."""
 
diff --git a/fbchat/_page.py b/fbchat/_page.py
index 53edf6c..aceb88b 100644
--- a/fbchat/_page.py
+++ b/fbchat/_page.py
@@ -1,10 +1,10 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from . import _plan
 from ._thread import ThreadType, Thread
 
 
-@attr.s
+@attrs_default
 class Page(Thread):
     """Represents a Facebook page. Inherits `Thread`."""
 
diff --git a/fbchat/_plan.py b/fbchat/_plan.py
index cb0a0c7..59e3941 100644
--- a/fbchat/_plan.py
+++ b/fbchat/_plan.py
@@ -1,6 +1,6 @@
 import attr
 import json
-from ._core import Enum
+from ._core import attrs_default, Enum
 from . import _util
 
 
@@ -10,7 +10,7 @@ class GuestStatus(Enum):
     DECLINED = 3
 
 
-@attr.s
+@attrs_default
 class Plan:
     """Represents a plan."""
 
diff --git a/fbchat/_poll.py b/fbchat/_poll.py
index 86a7c14..3273484 100644
--- a/fbchat/_poll.py
+++ b/fbchat/_poll.py
@@ -1,7 +1,8 @@
 import attr
+from ._core import attrs_default
 
 
-@attr.s
+@attrs_default
 class Poll:
     """Represents a poll."""
 
@@ -24,7 +25,7 @@ class Poll:
         )
 
 
-@attr.s
+@attrs_default
 class PollOption:
     """Represents a poll option."""
 
diff --git a/fbchat/_quick_reply.py b/fbchat/_quick_reply.py
index 653f31e..eb5ae86 100644
--- a/fbchat/_quick_reply.py
+++ b/fbchat/_quick_reply.py
@@ -1,8 +1,9 @@
 import attr
+from ._core import attrs_default
 from ._attachment import Attachment
 
 
-@attr.s
+@attrs_default
 class QuickReply:
     """Represents a quick reply."""
 
@@ -16,7 +17,7 @@ class QuickReply:
     is_response = attr.ib(False)
 
 
-@attr.s
+@attrs_default
 class QuickReplyText(QuickReply):
     """Represents a text quick reply."""
 
@@ -28,7 +29,7 @@ class QuickReplyText(QuickReply):
     _type = "text"
 
 
-@attr.s
+@attrs_default
 class QuickReplyLocation(QuickReply):
     """Represents a location quick reply (Doesn't work on mobile)."""
 
@@ -36,7 +37,7 @@ class QuickReplyLocation(QuickReply):
     _type = "location"
 
 
-@attr.s
+@attrs_default
 class QuickReplyPhoneNumber(QuickReply):
     """Represents a phone number quick reply (Doesn't work on mobile)."""
 
@@ -46,7 +47,7 @@ class QuickReplyPhoneNumber(QuickReply):
     _type = "user_phone_number"
 
 
-@attr.s
+@attrs_default
 class QuickReplyEmail(QuickReply):
     """Represents an email quick reply (Doesn't work on mobile)."""
 
diff --git a/fbchat/_state.py b/fbchat/_state.py
index 38cf767..78092fd 100644
--- a/fbchat/_state.py
+++ b/fbchat/_state.py
@@ -5,7 +5,7 @@ import requests
 import random
 import urllib.parse
 
-from ._core import log
+from ._core import log, attrs_default
 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
 
 
-@attr.s(slots=True)  # TODO i Python 3: Add kw_only=True
+@attrs_default  # TODO i Python 3: Add kw_only=True
 class State:
     """Stores and manages state required for most Facebook requests."""
 
diff --git a/fbchat/_sticker.py b/fbchat/_sticker.py
index 312b759..7189232 100644
--- a/fbchat/_sticker.py
+++ b/fbchat/_sticker.py
@@ -1,9 +1,9 @@
 import attr
-from ._core import Image
+from ._core import attrs_default, Image
 from ._attachment import Attachment
 
 
-@attr.s
+@attrs_default
 class Sticker(Attachment):
     """Represents a Facebook sticker that has been sent to a thread as an attachment."""
 
diff --git a/fbchat/_thread.py b/fbchat/_thread.py
index 6540a24..b517d1b 100644
--- a/fbchat/_thread.py
+++ b/fbchat/_thread.py
@@ -1,5 +1,5 @@
 import attr
-from ._core import Enum, Image
+from ._core import attrs_default, Enum, Image
 
 
 class ThreadType(Enum):
@@ -67,7 +67,7 @@ class ThreadColor(Enum):
         return cls._extend_if_invalid(value)
 
 
-@attr.s
+@attrs_default
 class Thread:
     """Represents a Facebook thread."""
 
diff --git a/fbchat/_user.py b/fbchat/_user.py
index 6e7e698..18dd773 100644
--- a/fbchat/_user.py
+++ b/fbchat/_user.py
@@ -1,5 +1,5 @@
 import attr
-from ._core import Enum, Image
+from ._core import attrs_default, Enum, Image
 from . import _util, _plan
 from ._thread import ThreadType, Thread
 
@@ -41,7 +41,7 @@ class TypingStatus(Enum):
     TYPING = 1
 
 
-@attr.s
+@attrs_default
 class User(Thread):
     """Represents a Facebook user. Inherits `Thread`."""