20 Gram Threaded CO2 (12 pack)Our new 20 gr. CO2 offers more firepower for your confetti cannon at an affordable price. Standard thread size 3 8" x 24 thread type ( small neck) (12pack) If you have a cannon the sometimes misfires, (weak shot) the reason could be not enough gas volume from the standard 16 gr CO2 that you have been using. Bad shots can happen when a cannon is overloaded with heavy confetti streamer products and if this is the case, you will get a sluggish shot.