Ultra-Pure Trombone Slide Lube, Alessi Formula has a really wonderful glide on all types of slides. It lasts a long time and does not gum up or leave residues. It has a fast, smooth feel that you will love! Nicely water-repellent and can be replenished with a little water mist. Used and endorsed by Joseph Alessi, Principal Trombone of the New York Philharmonic.