Probably the No.1 Valve Oil in the world and our best seller. Odorless 2oz bottle can be used as Slide and Key Oil. Does not separate in cold weather conditions. Suitable for Trumpet, Cornet and all Brass Instruments. Al Cass valve oil was originally developed in collaboration with Dizzy Gillespie and has become the ultimate fast valve oil on the market used by many of todays top musicians.