Greg Black bass trombone mouthpiece, model NEW YORK 1 1/8 GS, size Medium. - Brand: Greg Black - Model Name: NEW YORK 1 1/8 GS - Size: Medium Thank you for viewing. I received this from someone else around March. I used it for about a month, but it wasn't what I was looking for, so I'm selling it. There are shank marks, but there are no scratches that affect playing. Inner diameter: 28.75mm Thicker rim than the standard 1-1/8G.