Breakthrough cleans copper remover safely and effectively removes copper fouling and is 100% petroleum and ammonia free.Its virtually odorless and biodegradable formula easily removes copper fouling and minimizes future copper build up without giving off any harmful or strong offensive odors found in other copper removers.Usable on all types of bore steel and wont etch or harm the barrel.Size: 2 ozProtects: Against Copper Build Up/FoulingSuitable For: FirearmsEco-friendly: Yes