The Trombone Bushing/Shim Kit provides an extra pair of bushings with screws and three sets of shims for use with the Neotech Trombone Grip?�?�?�. It's great for musicians who want to use the Trombone Grip?�?�?� with a second instrument. The bushing remains on the instrument so you can move the grip to a second instrument in a matter of seconds. The kit is available in three options?�?�?�Straight Brace, Gusseted Straight Brace or Curved Brace. Select the option that's right for you!