300mm Smoker Tube is designed to slowly burn wood pellets to produce smoke, or supplement smoke, in all types of BBQ and smoker, whether gas or charcoal. It is especially good in smokers or grills where grate space is limited. and produces great smoke for cold smoking as well. The BBQ Gourmet 300mm Smoker Tube will burn up to 4 hours, depending on the smoker temps, type of pellets used, and the draft inside your smoker.