diff --git a/python/damask/_vtk.py b/python/damask/_vtk.py
index dbbfb1b10..561726153 100644
--- a/python/damask/_vtk.py
+++ b/python/damask/_vtk.py
@@ -2,6 +2,7 @@ import os
 import warnings
 import multiprocessing as mp
 from pathlib import Path
+from typing import Union, Optional, Literal, List
 
 import numpy as np
 import vtk
@@ -20,7 +21,7 @@ class VTK:
     High-level interface to VTK.
     """
 
-    def __init__(self,vtk_data):
+    def __init__(self, vtk_data: vtk.vtkImageData):
         """
         New spatial visualization.
 
@@ -36,7 +37,8 @@ class VTK:
 
 
     @staticmethod
-    def from_image_data(cells,size,origin=np.zeros(3)):
+    #ITERABLES PROPER
+    def from_image_data(cells: np.ndarray, size: np.ndarray, origin: Optional[np.ndarray] = np.zeros(3)) -> "VTK":
         """
         Create VTK of type vtk.vtkImageData.
 
@@ -66,7 +68,7 @@ class VTK:
 
 
     @staticmethod
-    def from_rectilinear_grid(grid,size,origin=np.zeros(3)):
+    def from_rectilinear_grid(grid: np.ndarray, size: np.ndarray, origin: np.ndarray = np.zeros(3)) -> "VTK":
         """
         Create VTK of type vtk.vtkRectilinearGrid.
 
@@ -98,7 +100,7 @@ class VTK:
 
 
     @staticmethod
-    def from_unstructured_grid(nodes,connectivity,cell_type):
+    def from_unstructured_grid(nodes: np.ndarray, connectivity: np.ndarray, cell_type: str) -> "VTK":
         """
         Create VTK of type vtk.vtkUnstructuredGrid.
 
@@ -138,7 +140,7 @@ class VTK:
 
 
     @staticmethod
-    def from_poly_data(points):
+    def from_poly_data(points: np.ndarray) -> "VTK":
         """
         Create VTK of type vtk.polyData.
 
@@ -172,7 +174,8 @@ class VTK:
 
 
     @staticmethod
-    def load(fname,dataset_type=None):
+    def load(fname: Union[str, Path],
+             dataset_type: Literal['vtkImageData', 'vtkRectilinearGrid', 'vtkUnstructuredGrid', 'vtkPolyData'] = None) -> "VTK":
         """
         Load from VTK file.
 
@@ -189,7 +192,7 @@ class VTK:
             VTK-based geometry from file.
 
         """
-        if not os.path.isfile(fname):                                                               # vtk has a strange error handling
+        if not os.path.isfile(fname):                                                  # vtk has a strange error handling
             raise FileNotFoundError(f'No such file: {fname}')
         ext = Path(fname).suffix
         if ext == '.vtk' or dataset_type is not None:
@@ -234,7 +237,7 @@ class VTK:
     def _write(writer):
         """Wrapper for parallel writing."""
         writer.Write()
-    def save(self,fname,parallel=True,compress=True):
+    def save(self, fname: Union[str, Path], parallel: bool = True, compress: bool = True):
         """
         Save as VTK file.
 
@@ -280,7 +283,7 @@ class VTK:
 
     # Check https://blog.kitware.com/ghost-and-blanking-visibility-changes/ for missing data
     # Needs support for damask.Table
-    def add(self,data,label=None):
+    def add(self, data: Union[np.ndarray, np.ma.MaskedArray], label: str = None):
         """
         Add data to either cells or points.
 
@@ -327,7 +330,7 @@ class VTK:
             raise TypeError
 
 
-    def get(self,label):
+    def get(self, label: str) -> np.ndarray:
         """
         Get either cell or point data.
 
@@ -369,7 +372,7 @@ class VTK:
             raise ValueError(f'Array "{label}" not found.')
 
 
-    def get_comments(self):
+    def get_comments(self) -> List[str]:
         """Return the comments."""
         fielddata = self.vtk_data.GetFieldData()
         for a in range(fielddata.GetNumberOfArrays()):
@@ -379,7 +382,7 @@ class VTK:
         return []
 
 
-    def set_comments(self,comments):
+    def set_comments(self, comments: Union[str, List[str]]):
         """
         Set comments.
 
@@ -396,7 +399,7 @@ class VTK:
         self.vtk_data.GetFieldData().AddArray(s)
 
 
-    def add_comments(self,comments):
+    def add_comments(self, comments: Union[str, List[str]]):
         """
         Add comments.
 
@@ -409,7 +412,7 @@ class VTK:
         self.set_comments(self.get_comments() + ([comments] if isinstance(comments,str) else comments))
 
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         """ASCII representation of the VTK data."""
         writer = vtk.vtkDataSetWriter()
         writer.SetHeader(f'# {util.execution_stamp("VTK")}')