Specially designed to clean the inside of the outer slide without damaging or scratching the metal. Turns a half hour job into one that takes less than five minutes and produces better (and safer) results. Includes special threaded steel rod, flexible bow tip and cloth sleeve (towelling sheath). This system is for large bore tenor trombones and bass trombones. Replacement cloths are available (sold separately). Purchase a red (small bore) cloth and this system can also then be used for your peashooter. -cdp