.590″ GIR MF1 Trumpet Mouthpiece $115.00 – $140.00 The Legends GIR MF1 is based on a Giardinelli MF1 like the one played by Maynard Ferguson in the mid to late 1960’s. The inside diameter is .590″, and the cup is a shallow V-bowl. The throat is an open #26, and the backbore is the Legends Manhattan. Use the GIR MF1 when you’re ready to “come blow your horn”! Select options