Hetman® Synthetic Piston Lubricants provide superior wear and corrosion protection for all types of piston valves. Whether your instrument has Monel, stainless steel, or nickel-plated pistons, these long-lasting, non-gumming lubricants will provide for an action that is smooth, quick and consistent. Synthetic protection for your classic instrument. Specially formulated oil helps to seal piston valves that exhibit greater than average clearance. Helps prevent valves from sticking.