diff --git a/aiogram/utils/callback_data.py b/aiogram/utils/callback_data.py
index bb7d6862..090b1920 100644
--- a/aiogram/utils/callback_data.py
+++ b/aiogram/utils/callback_data.py
@@ -31,10 +31,8 @@ class CallbackData:
             raise TypeError(f"Prefix must be instance of str not {type(prefix).__name__}")
         elif not prefix:
             raise ValueError('Prefix can\'t be empty')
-        elif len(sep) != 1:
-            raise ValueError(f"Length of sep should be equals to 1")
         elif sep in prefix:
-            raise ValueError(f"Symbol '{sep}' can't be used in prefix")
+            raise ValueError(f"Separator '{sep}' can't be used in prefix")
         elif not parts:
             raise TypeError('Parts is not passed!')
 
@@ -63,14 +61,12 @@ class CallbackData:
                 else:
                     raise ValueError(f"Value for '{part}' is not passed!")
 
-            if not isinstance(value, str):
-                raise TypeError(f"Value must be instance of str not {type(value).__name__}")
-            elif not value:
+            if not value:
                 raise ValueError(f"Value for part {part} can't be empty!'")
             elif self.sep in value:
                 raise ValueError(f"Symbol defined as separator can't be used in values of parts")
 
-            data.append(value)
+            data.append(str(value))
 
         if args or kwargs:
             raise TypeError('Too many arguments is passed!')