Fuel Mix (% butane/propane): Scorpion (100% butane), Primus (75/25), Outlander (70/30), Isobutane (80% isobutane, 20% propane) * Butane Stove Fuel 8 oz: Includes a collar notch on top of the canister that provides easy alignment in appliances. * 250g Bayonet Butane: Equipped with self-sealing safety valve and bayonet joint.