The Allora ATB-550 Paris Series professional trombone is an affordable trombone with professional-level features and quality. The .547 bore offers a larger overall sound than a student trombone all projected through the 8.5 yellow brass bell. Featuring interchangeable leadpipes for desired playing resistance a free-blowing axial flow valve along with the well-weighted hand slide the ATB-550 is a great choice for any advancing trombone player. The ATB-550 comes complete with a premium nylon polyfoam case a large shank mouthpiece and a three-year warranty. Allora instruments are carefully manufactured to play well are durable and possess a satisfying tone and dynamics capability all with a price that makes it much easier to get involved with music.