Alisyn Heavy Duty Key Oil is a higher viscosity premium synthetic oil that offers performance advantages to professional musicians, repair shops and serious amateurs. The oil is clean and clear and is stain resistant. It provides exceptional rust, friction and wear protection. This oil has been specially formulated to perform on larger and vintage woodwind instruments where tolerances between pivot screws, rod and bearing surfaces may be greater. The oil remains serviceable at temperature ranges from -80 degrees F to 400 degrees F (instruments are sometimes subjected to temperature extremes during transport).