Yamaha YSL-154S Overview Yamaha standard trombones were designed to make it easier for beginning students to sound good as soon as possible. They are produced in Yamaha workshops by highly trained craftspeople with very similar specifications and manufacturing processes as they use on their top of the line models. The standard models are durable, high quality trombones which offer a perfect entry into the world of music. Specifications Key Bb Bell Material Yellow brass Bell Diameter 204.4mm（8”） Bore Size M: 12.7mm (0.5″) Outer Slide Material Yellow brass Inner Slide Material Nickel Silver Finish Silver plated Mouthpiece SL-48S Case Included
