Carlson’s NEW Choke Tube and Carbon Cleaner is nonflammable,non hazardous and it is biodegradable. It provides you with a safe and effective way to clean carbon and plastic wad fouling from choke tubes and all of those semi automatic shotguns gas system parts. This product also works well to clean AR-15 and other rifle bolt assemblies. Completes the job in 15 minutes or less! Supplied in a 7 oz jar.