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Bach Stradivarius 42AF Tenor Trombone Outfit w/ F Attachment The Bach 42AF is the newest and most exciting development in Bach Stradivarius professional trombones. It features the new "Infinity" axial flow valve. This patented valve design eliminates the metal-to-metal contact found in any other axial flow design through the use of sealed bearings both in the nose and in the back plate. This assures tight tolerances that will resist wear over time. The 8-1/2" one-piece hand-hammered yellow brass Bach 42 bell has defined the symphonic sound for generations. The .547" large bore combined with the patented "Infinity" valve and open wrap F attachment offers a warm sound, great projection, and an efficient and open feel. .547" Large Bore 8.5" one-piece hand-hammered yellow brass bell Open Wrap F attachment with Axial flow valve Grenadilla wood thumb lever Mini ball linkage Yellow brass outer slide Clear lacquer