These 300ml bottles of Special Blue butane are cold filtered 9x to remove impurities. These cans are filled with 99.995% pure and premium European butane gas for use with refillable lighters. These 300ml bottles of Special Blue butane are cold filtered 9x to remove impurities. Each cap contains various adapters that makes it compatible with virtually every lighter. These cans are filled with 99.995% pure and premium European butane gas for use with refillable lighters.