Specially made with close attention to tight tolerances,
 the new Armex Airstream 12-gram CO2 cartridges have uniform neck dimensions.
 That makes it more likely that every cartridge will pierce properly
 and gas will be evenly dispersed into your air gun.
 
PLEASE NOTE: These are 12gram non threaded Co2 capsules designed for use in Co2 powered
 air rifles and pistols ONLY. 
Diameter 18.6mm, Length 83mm (approx.).