Ultra-Pure Alessi Formula Trombone Slide Lube has the perfect balance of speed, smoothness and endurance. It goes on easily and does not build up. It does not separate under hot or freezing conditions. A few drops on each stocking and a few drops on the upper part of the slide is all you will need for several days of playing. Nicely water-repellent, your slide action can be renewed with a little water mist. Used and endorsed by Joseph Alessi, Principal Trombone of the New York Philharmonic. 1 fluid ounce (30 ml).