Quintuplus filtered premium Vector butane gas refills are highly recommended for the iolite and all gas lighters. Have you ever had problems with refillable lighters? Well it's most likely from filling them with inferior butane. Inferior butane brands like Ronson, Clipper and Sun will clog the internal burner cylinder and affect the performance of your iolite or lighter. Vector is Quintuplus filtered, meaning at least 5 times! In our opinion this is the best butane available!