Willie's Horn Mouthpiece AG18.5ES Gold Plated Inner diameter 18.5mm, throat 4.4mm, V-cup shape. The depth isn't specified on the manufacturer's website, but subjectively, it seems to be medium-depth compared to other manufacturers. ES is a Schmidt shank. Willie's mouthpieces are divided into 5 different shank types, but I'm not sure how well this one fits, so please be aware of that. Retail price: 47,300 yen The gold plating has some scratches from inserting and removing the shank. The surface has fine scratches, but it's in good condition overall.