Two types of cast iron woks can be found in the market. Chinese-made cast iron woks are very thin (), weighing only a little more than a carbon steel wok of similar size, while cast iron woks typically produced in the West tend to be much thicker (), and very heavy. Because of the thickness of the cast iron, Western-style cast iron woks take much longer to bring up to cooking temperature, and their weight also makes stir-frying and "bao" techniques difficult.