FourFriends Natural Snacks is a popular natural treat from Switzerland. Beef Lung is the lung of the cow and is perfect as a healthy snack and works especially well for an upset stomach. The chewing resistance contributes to increased dental health.FourFriends Beef Lung is heat-treated and carefully dried to maintain useful nutrients, and this healthy snack is also 100% natural and gluten-free. Made from controlled ingredients and no added preservatives. Size: 100g and 800g