Thank you for viewing. I am selling a used JK (York) 12DM horn mouthpiece. ● Rim Size (Outer Diameter / Inner Diameter) 12 (25.75mm / 17.75mm) ● Cup (Bore Size / Depth) DM (4.2mm / medium) The inner diameter is slightly wider than standard mouthpieces, so it is recommended for those who are concerned about the thickness of their lips. There are scratches and dirt due to the long period of use. Therefore, I will sell it for 7000 yen, which is about half the list price. * Box not included.