Hetman Piston Lubricant maintains average clearance piston valves with a carefully formulated synthetic formula. All Hetman Musical Instrument Lubricants offer superior lubricating qualities, are longer-lasting than other lubricants, and are completely compatible with conventional petroleum-based lubricants, thereby avoiding potential gumming problems. The viscosity of each Hetman instrument lubricant is carefully formulated for its specific purpose and assures both fast, positive action and vital protection against wear and corrosion.