Aerotechnics CO2 cartridges are the perfect companion to our Pocket Cannons, Streamer Wands and Fireworks Cannons. It never hurts to have a few extra! Available individually or in discount packs of 12, 24, 100 or 300. High pressure rated to 900 psi. One cylinder is required for each firing. All sizes have 3/8 inch x 24 NF threads. 8oz.