A light viscosity synthetic lubricant formulated for instruments with close tolerance actions. Frees sticking keys by penetrating into hinge tubes. Provides for a smooth, quick action. Hetman® Synthetic Key Lubricants are specifically designed for musical instrument keys that utilize hinge tube and rod construction. These high technology lubricants provide superior key action by establishing a tenacious, synthetic lubricating film between the hinge rods and hinge tubes. This protective synthetic