Model Number: R2a Silver Plated Inner Diameter: 17.25mm Throat Diameter: 4.05mm (Standard) Rim Width: 3.8 Cup Shape: V-Cup Shank: American Purchased about a year ago for 25,300 yen. HMG Brass Instrument Technology has a workshop in Osaka and is handmade with precise craftsmanship. The rim is thin, allowing for a sense of freedom in the mouth, and the V-cup gives a feeling of solid breath support. Also, the cup is deep, giving the impression of a well-defined sound. The exterior has a matte finish and a shape like a work of art. There are some minor scratches on the shank from instrument attachment. Will be shipped in the original box.