diff --git a/satisfactory/__init__.py b/satisfactory/__init__.py
index 9942279..0b5dda9 100644
--- a/satisfactory/__init__.py
+++ b/satisfactory/__init__.py
@@ -1,7 +1,8 @@
 import os
 import json
 
-from typing import Dict, Generator
+from typing import Dict, Generator, Iterable
+
 
 class Cookbook(object):
     __recipes: Dict[str, Dict]
@@ -19,7 +20,7 @@ class Cookbook(object):
     def __getitem__(self, item: str) -> Dict[str, Dict]:
         return self.__recipes[item]
 
-    def all(self):
+    def all(self) -> Iterable[str]:
         return self.__recipes.keys()
 
     def recipes(self, name: str) -> Dict:
@@ -28,11 +29,11 @@ class Cookbook(object):
     def is_component(self, name: str) -> bool:
         return 'component' in self.__recipes[name]['type']
 
-    def components(self) -> Generator[Dict, None, None]:
+    def components(self) -> Generator[str, None, None]:
         return (i for i in self.all() if self.is_component(i))
 
     def is_resource(self, name: str) -> bool:
         return 'resource' in self.__recipes[name]['type']
 
-    def resources(self) -> Generator[Dict, None, None]:
+    def resources(self) -> Generator[str, None, None]:
         return (i for i in self.all() if self.is_resource(i))