Well! Before long you realise you were supposed to be oiling your “rotors”. This is the heavier version of rotor oil, if you need something a bit thicker to get things moving smoothly. A specially designed precision tip with a cover that means you won’t have to put this bottle in a plastic bag!
This stuff is fully synthetic and designed to clean, protect, and lubricate your rotors. Throw it on French horns, trumpets and tubas.