8 Gram Highest Quality European Carbon Dioxide (CO2) Seltzer Chargers for making homemade Club Soda * Each carton contains 10 CO2 Soda Cartridges- 8 grams of CO2 per cartridge * Compatible: all current model soda siphons including iSi, Kayser, Mosa, Liss * Produced in Europe"s most modern facility by Austrian based company with decades of experience in this technology * The carton of 10 cartridges is perfect size for locations with limited space or the occasional user- minimum shelf life of 5 years