Instant purchase is welcome. French Horn Mouthpiece YORK-CAR EX Model M Series (U Cup) 1 2 DM (Box + Included Brush + Seal) Rim Inner Diameter: 17.75mm / Bore Size: 4.2mm / Cup Depth: Medium / Double Shank I tried it once after purchase. There are scratches from polishing and signs of attachment. There is an initial color unevenness near the backbore exit (4th photo). It has been cleaned. This is a used item, so please purchase only if you understand.