Horn Mouthpiece Giardinelli G17 American Shank The information is vague, but... Inner Diameter: 17.5mm (Feels smaller than this in reality) Bore Size: 4.4mm Cup Depth: Deep Rim: Thin Currently discontinued and difficult to obtain. This is a long-term storage item, but it's unused. The original purchase price was 9000 yen. A must-have item for Giardinelli fans. Due to long-term storage, there is some blackening and slight dirt, but it should come off with polishing. I'm selling it as is because I'm afraid of the plating coming off. It will be shipped via Nekopos in an air cushion bag (bubble wrap). This is considered a used item, so please purchase only if you understand.