The CO2 refill cartridge is the ideal helper for reinflating your tire or inner tube. This accessory is designed to make refilling easier and is suitable for road bikes, mountain bikes, city bikes, and e-bikes. The CO2 refill cartridge contains air calibrated to the pressure required by all bicycle tires. Tubeless tires are inflated to 2.5/3.0 Bar for mountain bikes and 7/9 Bar for road bikes, depending on the diameter of the tube. A CO2 refill cartridge can only be used once. To avoid the cooling effects on your hands, you should handle the cartridge with a shield or wear gloves while using it.