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.
Multipurpose brass and woodwind lubricant for flat springs and tracks, pivot screws, wing/neck screws, joints, linkage, hinges, levers, valve stems and caps, and screw bells. Guards against wear and corrosion. Waterproof synthetic. Plastic-safe.