Carlson&';s 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. Supplied in a 7 oz jar.