Bass Trombone Mouthpiece B. Tilz NEA model 8GT Rim size: 28.0mm This model has more weight compared to the same Tilz Spezial model. Despite the weight, it responds well and feels maneuverable. I was using it with a sub-instrument, but I'm selling it because the size is a little small for me. I didn't use it often, so it's in relatively clean condition. There are some minor scratches, such as shank scratches. In my opinion, it seems to be compatible with instruments from any manufacturer. The rim is wide and slightly flat, which gives the impression of being easy to play. The feel in the mouth is slightly smaller than the numerical value suggests. It's in relatively clean condition, but please understand that it is a used item.