Description Product Description In creating the new YSL-872 alto trombone, Yamaha has effectively combined its advanced wind instrument technology, nurtured in the making of the Xeno series, with traditional craftsmanship in a basic design. This instrument features a brilliant, rich sound and superior intonation. It gives artists amazing expressive freedom for optimum performance in all genres and styles - an essential quality for today's wide-ranging musical scene - and is certain be loved by trombone players all over the world. We are proud to present our latest Alto Trombone model YSL-872 targeting the professional and high level amateurs. The YSL-872 Alto trombone in Eb/D has a 1/2 step trill valve C#, developed with Larry Zalkind. Professional model Key: Eb/D with trill valve and D & C# slide Bore: 11.95mm-12.45mm (0.470"-0.490") Hand-hammered yellow brass one piece bell: 181.8mm (7-1/8") Hand-lapped tuning slides Pressure-formed tubing Outer and Inner Slides: nickel-silver Model: YSL-872 Manufacturer: Yamaha