Kingii 12g CO2 Disposable Cartridge 3/8" Threaded with 24 Threads per inch - 5-Pack 12g CO2 DISPOSABLE CARTRIDGE 3/8" threaded with 24 threads per inch ENGINEERED and DESIGNED specifically for our Kingii wearable floatation devices INSTANTLY READY YOUR KINGII wearable for your water safety YOU SHOULD NEVER NEED TO BUY THESE as we hope you never have to use our KINGII wearable. Increasing water safety awareness is our mission.