An APM exclusive, this unique and innovative product contains a fully adjustable attachment ring, Our adjustable attachment ring permits this trombone lyre to be attached to nearly every manufacturer's trombone receiver. Available in one piece (#511-A) or with a movable head (#514-A), in brass or nickel finish. The one-piece has a fixed lyre head. The tenor trombone lyre has a 9/16” ID receiver ring (#511-T). The bass trombone lyre features a 11/16” ID receiver ring (#511-B).