Glanz Brace Trombone parts made by Gakki Kobo Glanz Trombone. [Description from retailers] ↓ This is a lightweight screw-type brace, weighing approximately 12g, that is attached to the slide crook of a trombone. By attaching it, you can change the playing feel and sound. * Can be attached to instruments with wide crooks, but is not compatible with narrow slides such as those found on small bore trombones or narrow slides. ★ I bought this new and tried it out a few times. The resistance changed, and I could feel a difference in the playing feel even with the same instrument.