diff --git a/scrapling/core/_types.py b/scrapling/core/_types.py
index 8816b90..84e9a51 100644
--- a/scrapling/core/_types.py
+++ b/scrapling/core/_types.py
@@ -5,6 +5,8 @@ Type definitions for type checking purposes.
 from typing import (TYPE_CHECKING, Any, Callable, Dict, Generator, Iterable,
                     List, Literal, Optional, Pattern, Tuple, Type, Union)
 
+SelectorWaitStates = Literal["attached", "detached", "hidden", "visible"]
+
 try:
     from typing import Protocol
 except ImportError:
diff --git a/scrapling/engines/camo.py b/scrapling/engines/camo.py
index 2c0ff3d..f1d8f95 100644
--- a/scrapling/engines/camo.py
+++ b/scrapling/engines/camo.py
@@ -3,7 +3,7 @@ from camoufox.async_api import AsyncCamoufox
 from camoufox.sync_api import Camoufox
 
 from scrapling.core._types import (Callable, Dict, List, Literal, Optional,
-                                   Union)
+                                   SelectorWaitStates, Union)
 from scrapling.core.utils import log
 from scrapling.engines.toolbelt import (Response, StatusText,
                                         async_intercept_route,
@@ -18,7 +18,7 @@ class CamoufoxEngine:
             self, headless: Optional[Union[bool, Literal['virtual']]] = True, block_images: Optional[bool] = False, disable_resources: Optional[bool] = False,
             block_webrtc: Optional[bool] = False, allow_webgl: Optional[bool] = True, network_idle: Optional[bool] = False, humanize: Optional[Union[bool, float]] = True,
             timeout: Optional[float] = 30000, page_action: Callable = None, wait_selector: Optional[str] = None, addons: Optional[List[str]] = None,
-            wait_selector_state: str = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None,
+            wait_selector_state: Optional[SelectorWaitStates] = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None,
             proxy: Optional[Union[str, Dict[str, str]]] = None, os_randomize: Optional[bool] = None, disable_ads: Optional[bool] = True,
             geoip: Optional[bool] = False,
             adaptor_arguments: Dict = None,
diff --git a/scrapling/engines/pw.py b/scrapling/engines/pw.py
index e434032..0a6d30d 100644
--- a/scrapling/engines/pw.py
+++ b/scrapling/engines/pw.py
@@ -1,6 +1,7 @@
 import json
 
-from scrapling.core._types import Callable, Dict, Optional, Union
+from scrapling.core._types import (Callable, Dict, Optional,
+                                   SelectorWaitStates, Union)
 from scrapling.core.utils import log, lru_cache
 from scrapling.engines.constants import (DEFAULT_STEALTH_FLAGS,
                                          NSTBROWSER_DEFAULT_QUERY)
@@ -23,7 +24,7 @@ class PlaywrightEngine:
             page_action: Callable = None,
             wait_selector: Optional[str] = None,
             locale: Optional[str] = 'en-US',
-            wait_selector_state: Optional[str] = 'attached',
+            wait_selector_state: SelectorWaitStates = 'attached',
             stealth: Optional[bool] = False,
             real_chrome: Optional[bool] = False,
             hide_canvas: Optional[bool] = False,
diff --git a/scrapling/fetchers.py b/scrapling/fetchers.py
index 86f77ae..bdf87a6 100644
--- a/scrapling/fetchers.py
+++ b/scrapling/fetchers.py
@@ -1,5 +1,5 @@
 from scrapling.core._types import (Callable, Dict, List, Literal, Optional,
-                                   Union)
+                                   SelectorWaitStates, Union)
 from scrapling.engines import (CamoufoxEngine, PlaywrightEngine, StaticEngine,
                                check_if_engine_usable)
 from scrapling.engines.toolbelt import BaseFetcher, Response
@@ -176,8 +176,8 @@ class StealthyFetcher(BaseFetcher):
             self, url: str, headless: Optional[Union[bool, Literal['virtual']]] = True, block_images: Optional[bool] = False, disable_resources: Optional[bool] = False,
             block_webrtc: Optional[bool] = False, allow_webgl: Optional[bool] = True, network_idle: Optional[bool] = False, addons: Optional[List[str]] = None,
             timeout: Optional[float] = 30000, page_action: Callable = None, wait_selector: Optional[str] = None, humanize: Optional[Union[bool, float]] = True,
-            wait_selector_state: str = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None, proxy: Optional[Union[str, Dict[str, str]]] = None,
-            os_randomize: Optional[bool] = None, disable_ads: Optional[bool] = True, geoip: Optional[bool] = False,
+            wait_selector_state: SelectorWaitStates = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None,
+            proxy: Optional[Union[str, Dict[str, str]]] = None, os_randomize: Optional[bool] = None, disable_ads: Optional[bool] = True, geoip: Optional[bool] = False,
     ) -> Response:
         """
         Opens up a browser and do your request based on your chosen options below.
@@ -234,8 +234,8 @@ class StealthyFetcher(BaseFetcher):
             self, url: str, headless: Optional[Union[bool, Literal['virtual']]] = True, block_images: Optional[bool] = False, disable_resources: Optional[bool] = False,
             block_webrtc: Optional[bool] = False, allow_webgl: Optional[bool] = True, network_idle: Optional[bool] = False, addons: Optional[List[str]] = None,
             timeout: Optional[float] = 30000, page_action: Callable = None, wait_selector: Optional[str] = None, humanize: Optional[Union[bool, float]] = True,
-            wait_selector_state: str = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None, proxy: Optional[Union[str, Dict[str, str]]] = None,
-            os_randomize: Optional[bool] = None, disable_ads: Optional[bool] = True, geoip: Optional[bool] = False,
+            wait_selector_state: SelectorWaitStates = 'attached', google_search: Optional[bool] = True, extra_headers: Optional[Dict[str, str]] = None,
+            proxy: Optional[Union[str, Dict[str, str]]] = None, os_randomize: Optional[bool] = None, disable_ads: Optional[bool] = True, geoip: Optional[bool] = False,
     ) -> Response:
         """
         Opens up a browser and do your request based on your chosen options below.
@@ -308,7 +308,7 @@ class PlayWrightFetcher(BaseFetcher):
     def fetch(
             self, url: str, headless: Union[bool, str] = True, disable_resources: bool = None,
             useragent: Optional[str] = None, network_idle: Optional[bool] = False, timeout: Optional[float] = 30000,
-            page_action: Optional[Callable] = None, wait_selector: Optional[str] = None, wait_selector_state: Optional[str] = 'attached',
+            page_action: Optional[Callable] = None, wait_selector: Optional[str] = None, wait_selector_state: SelectorWaitStates = 'attached',
             hide_canvas: Optional[bool] = False, disable_webgl: Optional[bool] = False, extra_headers: Optional[Dict[str, str]] = None, google_search: Optional[bool] = True,
             proxy: Optional[Union[str, Dict[str, str]]] = None, locale: Optional[str] = 'en-US',
             stealth: Optional[bool] = False, real_chrome: Optional[bool] = False,
@@ -368,7 +368,7 @@ class PlayWrightFetcher(BaseFetcher):
     async def async_fetch(
             self, url: str, headless: Union[bool, str] = True, disable_resources: bool = None,
             useragent: Optional[str] = None, network_idle: Optional[bool] = False, timeout: Optional[float] = 30000,
-            page_action: Optional[Callable] = None, wait_selector: Optional[str] = None, wait_selector_state: Optional[str] = 'attached',
+            page_action: Optional[Callable] = None, wait_selector: Optional[str] = None, wait_selector_state: SelectorWaitStates = 'attached',
             hide_canvas: Optional[bool] = False, disable_webgl: Optional[bool] = False, extra_headers: Optional[Dict[str, str]] = None, google_search: Optional[bool] = True,
             proxy: Optional[Union[str, Dict[str, str]]] = None, locale: Optional[str] = 'en-US',
             stealth: Optional[bool] = False, real_chrome: Optional[bool] = False,