This 8 oz. bottle is to refill the valve oil in MusicNomad's 2 oz. dropper bottle (sold separately). This innovative, premium formula is like no other. Scientifically designed to provide fast, long-lasting valve action, MusicNomad's Valve Oil does not build up while protecting against rust and corrosion. The synthetic ingredients used are biodegradable, non-toxic, odorless and petroleum-free.