The Unison Cast Iron Gas Cooker #Gb-07 Single Burner (3 Ring) F with model number #2380 is a durable and long lasting product. It is made of 100% cast iron and offers superb heat retention. The Unison Cast Iron Gas Cooker #Gb-07 Single Burner (3 Ring) F is a durable and long lasting product. It is made of 100% cast iron and offers superb heat retention. Made of 100% cast iron Better heat retention Durability and longevity Adjustable flame control for each burner