This Butane Gas 300ml Refill Canister is purified 11 times for a clean and reliable burn up to 1350ºC. It's filled with 60% butane, 36% isobutane, and 2% propane, providing an optimal blend for efficient performance. A universal connection and multiple adaptors in the cap make it simple to refill your appliances. Plus, it's refillable, so you can keep using it.