We made this stuff from the ground up to make the master happy, and it’s the only thing he uses. There’s a good reason Doc Severinsen is one of the greatest trumpet players of all time–he’s extremely picky. We started sending him valve oil samples, and he loved them, but would constantly want to tweak them until they were just right. Well we finally got it right and he’s in love! This is the valve oil Doc loves and uses. It is a fully synthetic oil that is designed to clean, protect, and lubricate your valves.