Boiler diameter : about 4 1/2 inches. All made of copper and brass. It will be a great addiction to any collection, also its just perfect for decoration! Very heavy and massive build. The model needs cleaning and polishing as I see and it has some scratches and paint loss and traces of dust and pathina on it.All parts are moving free. The item "Antique Live Steam Boiler Steam Engine 1900 Large Stationary Pressure" is in sale since Wednesday, May 31, 2017. This item is in the category "Toys & Hobbies\Vintage & Antique Toys\Other Vintage & Antique Toys". The seller is "extraretro" and is located in Bulgaria. This item can be shipped worldwide.