The only approved butane recommended for fueling the T-MTC-51 Micro Torch and all other Master butane-powered Ultratorch and Microtorch products. Butane is produced using the purest refining method possible. Special non-clogging formula permits extended use. Contains no CFCs (chlorofluorocarbons). Will not harm the ozone layer. Each canister comes with a convenient single-piece universal filling tip. Canister size equals 2 fl. oz. (56.5 grams), sold singly or 36 canisters per case.