diff --git a/comfy_api/v3/io.py b/comfy_api/v3/io.py
index b8867f3d0..825d59538 100644
--- a/comfy_api/v3/io.py
+++ b/comfy_api/v3/io.py
@@ -1,10 +1,13 @@
 from __future__ import annotations
-from typing import Any, Literal
+from typing import Any, Literal, TYPE_CHECKING, TypeVar
 from enum import Enum
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, asdict
 from comfy.comfy_types.node_typing import IO
 
+# if TYPE_CHECKING:
+import torch
+
 
 class InputBehavior(str, Enum):
     required = "required"
@@ -60,11 +63,14 @@ class IO_V3:
     '''
     Base class for V3 Inputs and Outputs.
     '''
+    Type = Any
+
     def __init__(self):
         pass
 
-    def __init_subclass__(cls, io_type: IO | str, **kwargs):
+    def __init_subclass__(cls, io_type: IO | str, Type=Any, **kwargs):
         cls.io_type = io_type
+        cls.Type = Type
         super().__init_subclass__(**kwargs)
 
 class InputV3(IO_V3, io_type=None):
@@ -141,6 +147,7 @@ class BooleanInput(WidgetInputV3, io_type=IO.BOOLEAN):
     '''
     Boolean input.
     '''
+    Type = bool
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None, lazy: bool=None,
                  default: bool=None, label_on: str=None, label_off: str=None,
                  socketless: bool=None, widgetType: str=None):
@@ -159,6 +166,7 @@ class IntegerInput(WidgetInputV3, io_type=IO.INT):
     '''
     Integer input.
     '''
+    Type = int
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None, lazy: bool=None,
                  default: int=None, min: int=None, max: int=None, step: int=None, control_after_generate: bool=None,
                  display_mode: NumberDisplay=None, socketless: bool=None, widgetType: str=None):
@@ -183,6 +191,7 @@ class FloatInput(WidgetInputV3, io_type=IO.FLOAT):
     '''
     Float input.
     '''
+    Type = float
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None, lazy: bool=None,
                  default: float=None, min: float=None, max: float=None, step: float=None, round: float=None,
                  display_mode: NumberDisplay=None, socketless: bool=None, widgetType: str=None):
@@ -208,6 +217,7 @@ class StringInput(WidgetInputV3, io_type=IO.STRING):
     '''
     String input.
     '''
+    Type = str
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None, lazy: bool=None,
                  multiline=False, placeholder: str=None, default: int=None,
                  socketless: bool=None, widgetType: str=None):
@@ -224,6 +234,7 @@ class StringInput(WidgetInputV3, io_type=IO.STRING):
 
 class ComboInput(WidgetInputV3, io_type=IO.COMBO):
     '''Combo input (dropdown).'''
+    Type = str
     def __init__(self, id: str, options: list[str]=None, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None, lazy: bool=None,
                  default: str=None, control_after_generate: bool=None,
                  image_upload: bool=None, image_folder: FolderType=None,
@@ -270,6 +281,7 @@ class ImageInput(InputV3, io_type=IO.IMAGE):
     '''
     Image input.
     '''
+    Type = torch.Tensor
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None):
         super().__init__(id, display_name, behavior, tooltip)
 
@@ -277,6 +289,7 @@ class MaskInput(InputV3, io_type=IO.MASK):
     '''
     Mask input.
     '''
+    Type = torch.Tensor
     def __init__(self, id: str, display_name: str=None, behavior=InputBehavior.required, tooltip: str=None):
         super().__init__(id, display_name, behavior, tooltip)
 
diff --git a/comfy_extras/nodes_v3_test.py b/comfy_extras/nodes_v3_test.py
index 5e2109355..49bef58d4 100644
--- a/comfy_extras/nodes_v3_test.py
+++ b/comfy_extras/nodes_v3_test.py
@@ -2,12 +2,19 @@ import torch
 from comfy_api.v3.io import (
     ComfyNodeV3, SchemaV3, InputBehavior, NumberDisplay,
     IntegerInput, MaskInput, ImageInput, ComboInput, CustomInput, StringInput, CustomType,
-    IntegerOutput, ImageOutput, MultitypedInput,
+    IntegerOutput, ImageOutput, MultitypedInput, InputV3, OutputV3,
     NodeOutput, Hidden
 )
 import logging
 
 
+class XYZInput(InputV3, io_type="XYZ"):
+    Type = tuple[int,str]
+
+class XYZOutput(OutputV3, io_type="XYZ"):
+    ...
+
+
 class V3TestNode(ComfyNodeV3):
 
     def __init__(self):
@@ -22,7 +29,8 @@ class V3TestNode(ComfyNodeV3):
             category="v3 nodes",
             inputs=[
                 ImageInput("image", display_name="new_image"),
-                CustomInput("xyz", "XYZ", behavior=InputBehavior.optional),
+                XYZInput("xyz", behavior=InputBehavior.optional),
+                #CustomInput("xyz", "XYZ", behavior=InputBehavior.optional),
                 MaskInput("mask", behavior=InputBehavior.optional),
                 IntegerInput("some_int", display_name="new_name", min=0, max=127, default=42,
                              tooltip="My tooltip 😎", display_mode=NumberDisplay.slider),
@@ -55,7 +63,7 @@ class V3TestNode(ComfyNodeV3):
         )
 
     @classmethod
-    def execute(cls, image: torch.Tensor, some_int: int, combo: str, xyz=None, mask: torch.Tensor=None):
+    def execute(cls, image: ImageInput.Type, some_int: IntegerInput.Type, combo: ComboInput.Type, xyz: XYZInput.Type=None, mask: MaskInput.Type=None):
         if hasattr(cls, "hahajkunless"):
             raise Exception("The 'cls' variable leaked instance state between runs!")
         if hasattr(cls, "doohickey"):