Alexander MY9 Cup Inner Diameter: 17.5mm Bore Size: 5.1mm Depth: 31.0mm Rim Width: 3.75mm Current Price: 13,500 yen No outer box. Purchased very recently and used only a few times. This is a rare, extra-large bore for Alexander, and you can take in a satisfying amount of air. Recommended for those who play low, or for use with a Wagner tuba.