diff --git a/src/models.py b/src/models.py
index f710d20..8d82aa9 100644
--- a/src/models.py
+++ b/src/models.py
@@ -131,7 +131,6 @@ class InnerKey(DarcKey):
 
 class AlphabetKey(DarcKey):
     key_type: DarcKeyType = DarcKeyType.alphabet
-    max_value: int = 255
 
     @classmethod
     def init_matrix(cls, width: int, height: int, max_value: int):
@@ -145,20 +144,18 @@ class AlphabetKey(DarcKey):
 
 class Mask(DarcKey):
     key_type: DarcKeyType = DarcKeyType.alphabet
-    max_value: int = 255
 
     @classmethod
     def init_matrix(cls, width: int, height: int, col_mask: int):
         """ originally buildScramble """
-
-        mask = cls._random_mask(width, cls.max_value)
+        max_value = 255
+        mask = cls._random_mask(width, max_value)
         matrix = [[0 for _ in range(width)] for _ in range(height)]
         if col_mask < height:
             matrix[col_mask] = mask
 
         return Mask(
             matrix=matrix,
-            max_value=cls.max_value
         )