S.E. Shires Custom Bass Trombone Gold Brass Bell w/Trubore Valves (STBVB-BTB)S. E. Shires Custom BII 7GM Bass Trombone: A Symphony of Elegance and Power Introducing the S. E. Shires Custom BII 7GM Bass Trombone, an exquisite testament to the art of trombone craftsmanship. This instrument encapsulates the essence of versatility, offering a clear, pure sound enriched by the depth and breadth for which S. E. Shires is renowned globally. Designed to meet the exacting standards of professional musicians, the BII 7GM stands as a