Crosman CO2 Powerlet are designed to provide a snug fit and solid seal for reliable and consistent performance on the target range. How fat can you shoot? CO2 power allows you to shoot in rapid succession without the need to manually pump between shoots. The 15-count box is ideal for the air rifle/pistol target sport enthusiast. It s also easy to install just follow the instructions on the packaging. Made of quality materials right here in the USA.