I have three 60cc CO2 cartridges for HitAir vests. I believe these will also work for Helite vests as well, but not totally positive. I purchased them in September 2023 to keep as backups, but I've gotten a new suit with an integrated vest and it doesn't accept these cartridges. Can do $30 shipped CONUS for each one, or all 3 for $80 shipped CONUS.