Feature: 1. Excellent Synthetic Oil Material: This piston valve oil is made of excellent synthetic oil material, which is safe, odorless, petroleum free, long lasting lubrication and prevents rusting. 2. Multifunctional: This synthetic valve oil provides superior lubrication for trombone manual slides, keeping wind instruments like the trombone clean, allowing for better playing and better sounding performance for a wide range of brass instruments. 3. Compact And Portable: This trumpet piston valve oil is 30ml per bottle which is small and lightweight, which makes it very convenient to carry and use on the go. 4. Easy To Use: This portable synthetic piston valve oil is easy to use, you just need to drop it onto the trombone puller, no other tools are needed. 5. Wide Application: This trombone piston lubricant provides long lasting, fast valve action and is suitable for lubrication and maintenance of tuned tubes. Specification: Item Type: Piston Valve Oil Material: Synthetic Oil Capacity: 30ml Per Bottle. Package List: 3 x Piston Valve Oil