Thomann Classic TF525 S, Bb- / F Tenor Trombone with F-Attachment, Traditional design (closed wrap), Bore: Ø 13.34 mm (.525"") Medium Large, Brass bell: Ø 203.00 mm (8""), Nickel silver outer slide, Hard chrome plated nickel silver inner slide, Ergonomic thumb rest, Completely silver-plated, Weight: 1.72 kg, Includes mouthpiece, Reka Super Slide and case with backpack strap