The Dynasty DEG HC250 Trombone Lyre clamps onto any trombone or cornet bell rim. This places it at a perfect distance away for easy reading. Molded from black ABS, the clamps are covered in slip resistant, non scratching material which will not effect the finish of the instrument when tightened down. The Spring loaded wind clips holds the windows and allows for easy flipping. Can be used with other marching brass instruments. Comes with 5 clear windows and held on by 2 plastic black rings.