This is a JK SF3 (V. Sander's model) horn mouthpiece. I usually use a 17.5 mouthpiece, and I bought this one to try it out, but unfortunately, it didn't feel right, so I'm going to sell it. Cup diameter: 17-3/4 (17.75) Bore diameter: 4.3 Cup type: K (V-cup) Shank: American I believe the rim, shank, etc. are in good condition with no scratches or deformation, but if you are concerned, I recommend purchasing a new one. *If there are no offers, I will reconsider the price, so please refrain from negotiating discounts. *There is no original box. It will be shipped in bubble wrap. *Shipping is unavailable between December 10th and December 17th. I apologize for the inconvenience.