Freejump Safety Vest Replacement Co2 CanistersFree Jump Airbag Safety Vest Replacement CO2 Cartridges (each sold separately) The Freejump cartridge is made of cast steel with a welded shutter, ensuring optimum safety and reliability. The characteristics of the cartridges are fundamental to ensuring efficient inflation. The quality of the seal is particularly important. A seal that is too thick becomes difficult to pierce; the CO2 evacuation hole is then too small and slows the gas release, thus