Thank you for viewing. Trombone Wise Grip - Large Type (Mainly for wide slides of large bore trombones) This is a trombone hand grip designed based on ergonomics. It disperses the center of gravity, which can be a burden on the left hand, allowing for a more stable hold. A stable left hand leads to a stable embouchure and comfortable slide action. I purchased this new about 5 years ago when I was having trouble with my playing, and it helped me for about 2 years. Thanks to this, I regained my feel, and my playing completely recovered. I couldn't let it go for a while, keeping it as a good luck charm, fearing I might lose my touch again (lol), but I've become stable throughout the year, so I'd like others to try it, and I'm putting it up for sale. If you're struggling with how to hold the trombone or how to do lip slurs, please give it a try! I apologize, but there is no box... I don't think it had one from the time of purchase.