La Tromba SOM2 Slide-O-Mix is a lubricant for the slide rods of trombones. It is specially designed to make the movement of the slide of the trombone smooth and easy. The lubricant consists of two components: a thin, liquid oil and a thicker, pasty substance. The thin oil is applied first to clean and lubricate the slide bars, and then the thicker substance is applied to properly fix the slide bars. La Tromba SOM2 Slide-O-Mix provides very smooth and easy operation of the trombone's slide and is used by professional trombonists around the world. It is a popular choice among musicians looking for a high-quality lubricant to improve their instrument's performance.