Yamaha Synthetic Rotor Oil - Yamaha synthetic rotor oil is more consistent than traditional oils, giving it better stability in different temperatures. In addition to a smoother feel, you will also be adding the life of your instrument thanks powerful corrosion inhibitor contained oil. The weight ideal for internal surface rotary valves, such as French horn, F-attachment or bass-guitars trombone rotors, valve tubas. band-and-orchestra, accessories for band-and-orchestra, Brass Care & Cleaning, Brass Lubricants, Rotary Oils