Traditionally chefs will use carbon steel woks in professional kitchens. They have the skills to operate these specialized pans and they save a lot of space in kitchens that are often tight on space. These woks come in both round and flat bottomed variety but the round-bottomed are the most common. Professional kitchens also commonly use gas burners which are the ideal hobs for using a wok as you use the flames to heat up the sides in an even manner.