Ultra Pure Plus extra purified butane gas has nearly zero impurities (more than 7x) and it's odorless. This high-end butane from England is widely considered one of the best in the world. Ultra Pure Plus Butane is made in the United Kingdom in the Keen plant, their flagship product, and bears the Near Zero logo. The label states that it is extra purified butane gas. Ultra Pure Plus Butane is comparable to Newport, Colibri and Lucienne. It also comes with a unique cap that has colored adapters that will work with almost all refillable butane powered device.