This is the GP specification of the Yani Booster. It is for Yanagisawa and Selmer saxophones. I used it a few times, but I've settled on a different setup, so I'm putting it up for sale. It appears to have no noticeable scratches or stains, but please understand that it is a used item before purchasing. I am also selling the PGP specification, so please take a look at that as well. If you purchase them together, I will offer a small discount! ★If you have any questions, please feel free to comment. #Saxophone #SopranoSaxophone #AltoSaxophone #TenorSaxophone #BaritoneSaxophone #Screw #NeckScrew #YANAGISAWA #SELMER