BG DUO for Alto Saxophone, Gold Plated, with Cap The BG DUO is very popular, even overseas. I purchased it a few years ago and used it a bit, but it's generally in good condition. *There is some peeling of the plating, as shown in the fourth photo. It produces a very well-defined sound and is a comfortable ligature to play. I threw away the original box, so I will ship it attached to a wine cork.