The S.E. Shires large bore tenor trombone was the first line of instruments Steve produced, and it quickly cemented his reputation as one of the world’s leading brass instrument designers. Players the world over have discovered that the Shires large bore tenor trombone is the ideal instrument for any orchestral setting, as well as being wonderfully resonant and responsive for solo and chamber music performance. Custom Large Bore, Axial Flow Valve, Yellow Brass Bell.