Griego Mouthpieces Model GP Bass Trombone

I have been playing the bass trombone for 35 years. I have played many good mouthpieces but never found a mouthpiece that does everything that I want it to do. The Griego GP is my Holy Grail of mouthpieces, it works in all registers for me, a clarity and focus of sound unmatched by any other mouthpiece that I have played. I can't recommend it highly enough, thank you Thomann.