The 42BO Stradivarius Series is the top selling Bach for advancing to professional players.The Bach 42BO Stradivarius Series F Attachment Trombone is a professional Strad model designed for a large symphonic sound that projects without distortion. The Bach 42BO features a .547-inch bore with an open wrap design for less resistance for the player. The Bach 42BO Stradivarius Series This morning was purchased two years ago my son played it for two years in high school and took it with him to college but used a school horn for marching band it is in excellent condition it has always been servicedBuy and Amro professional there are a couple of small dings at the end of the slide but that is itYou will not hurt my feelings with offers