Crafting is an in-game system that allows players to create specific items for use in Team Fortress 2. Crafting was introduced with the WAR! Update on December 17, 2009 Patch. The items that can be created include weapons, hats, and materials that can be used for further crafting, such as Scrap Metal or Class Tokens. Crafting is usually conducted by utilizing unwanted or duplicate items gained through the item drop system. In order to create items, the player must follow blueprints, all of which are initially available to players with a "premium" account. After following a valid blueprint recipe, the player will gain the item specified by the blueprint. If the player attempts to craft an item without the proper ingredients, an item will not be crafted whatsoever. Non-premium users cannot craft Rare or Special items, and tools cannot be crafted under any circumstances.