POLV Supper Light Cast Iron Wok Stir-Fry Pans No Chemical Coated Wok. Ultra-light Wok – The POLV Ultra-light Nitrided Cast Iron Wok combines a clean and modern look with the fine craftsmanship of this nearly 400-year-old Chinese wok manufacturer. This 11.8-inch ultra-light cast iron wok weighs only about 1.2 kg, offering effortless cooking and cleaning.