Breakthrough has made a biodegradable formula that actually removes copper and helps prevent copper build up with out barrel etching or odors. This formula was created to be good for your barrel and the environment at the same time giving you a clean barrel and not using ammonia or petroleum products from Breakthrough Technologies.Features:Quickly breaks down copper fouling and minimizes future copper build up100% ammonia freeUser safe and eco-friendlySafe on bore steelWon't etch or harm barrelsVirtually odorless and is biodegradable and petroleum free2 oz Spray bottleMade in the USA