The Yamaha 17B4 trumpet mouthpiece is characterized by the best workmanship thanks to state-of-the-art, computer-controlled machines. Especially for the classical trumpet player, the 17B4 mouthpiece is recommended by its open, clear tone. The medium round rim offers the musician a lot of flexibility, which is an advantage when playing large intervals. The medium flat cup provides a big and open sound, which allows more overtones than a deeper C cup. For the orchestral trumpet player this mouthpiece offers a great variety of sounds. The trumpet mouthpiece 17B4 from Yamaha has an inner diameter of 17,30 mm and a bore of 3,65mm.