This is a GR mouthpiece, which is rare in Japan as dealerships no longer carry it. I imported it personally, but I'm selling it because I don't use it. It has only been test-played a few times. The Eric and Wayne models didn't suit my lips, as the edges were too loose or the rims were quite thick. However, the 64SZ, with its larger inner diameter and shallow cup, was easy to control and significantly expanded my range. I don't think you can get this anymore. It comes with the original box. It's also recommended for collectors! The inner diameter is about the same as a Bach 3-5. The cup is about the middle of a Bach E-F. I think it's a mouthpiece with a very good sound attack and resonance. Because it's an SZ, high notes are easy to play. It gives the impression that not only high notes but also low to mid-range notes sound rich. I think it's a truly well-balanced mouthpiece. I spent a total of 68,000 yen on personal import. The list price is 57,000 yen. I will consider a slight discount. However, since it's almost unused, having only been test-played, I cannot offer a significant discount.