DETAILSAdvanced Sport Pellet replacement 2 Pack of 90 gram CO2 cylinders.Precision-built SIG ASP pistols and rifles depend on quality ammunition and fuel to perform up to SIG standards. And a higher-quality, cleaner gas in a superior-engineered cylinder can influence the lifetime and performance of any airgun. Investing in SIG premium cylinders is a simple way to ensure longer-lasting, SIG precision performance.