Trombone mouthpiece for large bore, Greg Black 5GS regular weight. Greg Black 5GS (rim inner diameter 25.7mm) regular weight. I bought it new and used it myself, so it shows signs of use, but I think it's in good condition. Please check the photos for marks on the shank insertion part. It's slightly larger than the general 5G size in terms of numbers, but I didn't feel any difference when playing. Instant purchase welcome, please comment if you have any questions or price negotiations. Thank you for viewing.