BVV™ Tri-Blend Premium Butane consists of 3 types of hydrocarbons in its blend resulting in a 99.999% purity rating. The hydrocarbons in this blend are 54% N-butane, 22% Propane, and 24% ISO-Butane. This premium canned butane is UK made and sourced from the North Sea and achieves a Grade A for the global standards of consumer products and backed by worldwide governing bodies of the following Quality Control institutions; BSI ISO9001:2008, British Retail Consortium Certification Body, SGS System Certification, UKAS, ANAB, and IAF. It comes in a 420ML can with ZERO impurities!