purified 5x times through several chambers of active carbon towers, which are made of charcoal filters that refine the butane gas from all impurities and odor. Optimum composition ratio of N-butane and ISO-butane molecules warrant maximum internal compression topping the industry. Most effective combustion quality assuring highest burn rate and cleanest burn. Extensive quality control; Final product goes through diligent inspection processes that follow the ISO 9001, TUV and EN-417 European Standard quality control procedures. 96 300ml cans (1 MASTER case) of GLOW! 5x refined butane fuel. Use only as directed. Keep out of reach of children.