Features: Valve, slide, and key oil Compact bottles that will fit in any brass case Premium brass valve oil for piston-valve brass devices like (pocket) trumpet, cornet, mellophone, flugelhorn, baritone, euphonium, tuba, etc By utilizing valve oil, it not just smooths your pistons, but also provides the longer life to your brass tool Packaging included: 1 bottle of Valve oil(30ml)