diff --git a/graphene/types/base.py b/graphene/types/base.py
index 84cb377a..734b9789 100644
--- a/graphene/types/base.py
+++ b/graphene/types/base.py
@@ -5,13 +5,13 @@ from ..utils.trim_docstring import trim_docstring
 
 
 class BaseOptions:
-    name = None  # type: str
-    description = None  # type: str
+    name: str = None
+    description: str = None
 
-    _frozen = False  # type: bool
+    _frozen: bool = False
 
     def __init__(self, class_type):
-        self.class_type = class_type  # type: Type
+        self.class_type: Type = class_type
 
     def freeze(self):
         self._frozen = True
diff --git a/graphene/types/enum.py b/graphene/types/enum.py
index e5cc50ed..f2c9e923 100644
--- a/graphene/types/enum.py
+++ b/graphene/types/enum.py
@@ -16,7 +16,7 @@ EnumType = type(PyEnum)
 
 
 class EnumOptions(BaseOptions):
-    enum = None  # type: Enum
+    enum: Enum = None
     deprecation_reason = None
 
 
diff --git a/graphene/types/inputobjecttype.py b/graphene/types/inputobjecttype.py
index 98f0148d..ccd946e5 100644
--- a/graphene/types/inputobjecttype.py
+++ b/graphene/types/inputobjecttype.py
@@ -10,8 +10,8 @@ if MYPY:
 
 
 class InputObjectTypeOptions(BaseOptions):
-    fields = None  # type: Dict[str, InputField]
-    container = None  # type: InputObjectTypeContainer
+    fields: Dict[str, InputField] = None
+    container: InputObjectTypeContainer = None
 
 
 class InputObjectTypeContainer(dict, BaseType):
diff --git a/graphene/types/interface.py b/graphene/types/interface.py
index 6503b78b..e031b11a 100644
--- a/graphene/types/interface.py
+++ b/graphene/types/interface.py
@@ -9,8 +9,8 @@ if MYPY:
 
 
 class InterfaceOptions(BaseOptions):
-    fields = None  # type: Dict[str, Field]
-    interfaces = ()  # type: Iterable[Type[Interface]]
+    fields: Dict[str, Field] = None
+    interfaces: Iterable[Type[Interface]] = ()
 
 
 class Interface(BaseType):
diff --git a/graphene/types/mutation.py b/graphene/types/mutation.py
index ad47c62a..8bd726a1 100644
--- a/graphene/types/mutation.py
+++ b/graphene/types/mutation.py
@@ -14,10 +14,10 @@ if MYPY:
 
 
 class MutationOptions(ObjectTypeOptions):
-    arguments = None  # type: Dict[str, Argument]
-    output = None  # type: Type[ObjectType]
-    resolver = None  # type: Callable
-    interfaces = ()  # type: Iterable[Type[Interface]]
+    arguments: Dict[str, Argument] = None
+    output: Type[ObjectType] = None
+    resolver: Callable = None
+    interfaces: Iterable[Type[Interface]] = ()
 
 
 class Mutation(ObjectType):
diff --git a/graphene/types/objecttype.py b/graphene/types/objecttype.py
index 1ff29a2e..1b5adde6 100644
--- a/graphene/types/objecttype.py
+++ b/graphene/types/objecttype.py
@@ -14,8 +14,8 @@ if MYPY:
 
 
 class ObjectTypeOptions(BaseOptions):
-    fields = None  # type: Dict[str, Field]
-    interfaces = ()  # type: Iterable[Type[Interface]]
+    fields: Dict[str, Field] = None
+    interfaces: Iterable[Type[Interface]] = ()
 
 
 class ObjectTypeMeta(BaseTypeMeta):
diff --git a/graphene/types/scalars.py b/graphene/types/scalars.py
index a468bb3e..8546bc85 100644
--- a/graphene/types/scalars.py
+++ b/graphene/types/scalars.py
@@ -121,8 +121,7 @@ class Float(Scalar):
     """
 
     @staticmethod
-    def coerce_float(value):
-        # type: (Any) -> float
+    def coerce_float(value: Any) -> float:
         try:
             return float(value)
         except ValueError:
diff --git a/graphene/types/union.py b/graphene/types/union.py
index f77e833a..a7d43edb 100644
--- a/graphene/types/union.py
+++ b/graphene/types/union.py
@@ -9,7 +9,7 @@ if MYPY:
 
 
 class UnionOptions(BaseOptions):
-    types = ()  # type: Iterable[Type[ObjectType]]
+    types: Iterable[Type[ObjectType]] = ()
 
 
 class Union(UnmountedType, BaseType):