S.E. Shires Trombone Mouthpiece Vintage 1-1/2G This is a bass trombone mouthpiece from the Vintage series by S.E. Shires. Outer rim diameter: 39.15mm Inner rim diameter: 27.20mm Throat: 7.00mm The rim is designed to be thicker, so it's likely a good choice for tenor trombone players who use smaller mouthpieces and are transitioning to bass trombone, allowing for a comfortable playing experience. *No box included*