The neotech trombone bushing shim kit is designed for use with the neotech trombone grip so you can use it on multiple instruments. The grip is helpful for those who experience fatigue when holding their trombones for prolonged periods. It is perfect for easing extra weight and prevents gripping too hard. This transfers the tension to where it needs to be and away from the hand and embouchure. The bushing wraps around your slide and comes in three different shapes to suit every instrument. The shims go inside these to form a tight fit. This bushing can then remain on your trombone and you can unclip the grip when not in use so it fits in your case. Using this separate bushing kit you can use the neotech grip on as many trombones as needed. Its ideal if you are performing with multiple instruments and want to quickly switch without compromising comfort!