XIKAR PUROFINE Premium Butane. Jet flame lighters are the fighter planes of lighters. They require the highest quality butane. Anything else is just like putting diesel fuel into an F-16. That is why XIKAR researched and found the highest quality butane available for its PUROFINE Premium Butane. Purofine's low level of impurities (less than 15 parts per million!) help keep your lighter functioning properly for years of use. Available in two sizes 1.9oz and 8oz. You can be sure that your lighter will be ready for action any time you are ready to relax with a smoke. Use in all XIKAR lighters ,Near zero impurities, Less than 15 parts per million impurities, Won't cause clogged burner valves or misfires