Bruno Tilz 6 1/2 AL Trombone Mouthpiece Set of 2, for Large Bore, Made of Aluminum for Durability and Improved Sound Quality. - Model: 6 1/2 AL - Material: Aluminum - Quantity: Set of 2 - Brand: Bruno Tilz Thank you for viewing. This is a set of two Tilz 6-1/2AL mouthpieces. I am selling them because I no longer use them after switching to a bass trombone. There are some scratches from use, but they are still usable. Please consider this when purchasing.