Hetman Tuning Slide Oil Medium The Hetman synthetic lubricants are about the best lubricating products available for brass or woodwind instruments They have a broad range of products for piston and rotary valves as well as trombone slide lubricants All Hetman Musical Instruments 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 lubricant is carefully formulated for its specific purpose and assures both fast, positive action and vital protection against wear and corrosion Light Tuning Slide Oil A light-viscosity synthetic lubricant designed for tighter fitting valve slides and for valve slides of linger length