Rotass CO2 chargers are small, disposable steel cylinders filled with highly compressed, 100% food-grade carbon dioxide (CO2). The gas is of a high purity, specifically manufactured for food and beverage applications. The steel casing is robust and designed to contain the high pressure safely. When used correctly with a compatible and well-maintained siphoning device, they are perfectly safe. Always ensure you purchase from a reputable supplier to avoid counterfeit products.