.624″ or .654″ JT RS Trumpet Mouthpiece $115.00 – $140.00 The JT RS was inspired by the Jet-Tone RS2, which was designed for and played by the legendary Roy Stevens. It has a round, soft rim available with inside diameters of .654″ (like the original Jet-Tone), and .624″. The cup is a shallow V bowl, and the backbore is the Legends Vegas. Select options