The 48cc airbag cartridge Hit Air is easily identifiable by its blue label. It is compatible with the Airbag vest Original Hit-Air (SV2/LV).
 
Cartridges Hit Air are announced as a precaution with a lifespan of 5 years, provided that they are not exposed to prolonged heat and that they are kept away from humidity.
The cartridges 48cc weigh 146g gross and contain 30g of Co². As a precaution, it is advised  to weigh the cartridges annually.