Thank you for viewing. This is a horn mouthpiece, JK 3CK A1. I purchased a Paxman and tried various mouthpieces, but I've decided to use something different, so I'm offering this one for sale. It was used for about a month. Cup Inner Diameter: 17.0mm Cup Depth: Semi-deep Cup Shape: V-cup Bore Size: 4.4mm Retail Price: 15,400 yen (tax included) Purchase Price: 13,090 yen (tax included) Because the cup diameter is small and deep, it's easy to produce both high and low notes, and the tone has depth. I think it's also easy to control. Thank you.