Thank you for viewing. Monette Resonance PRANA Adam Rapa model B3FS7 Cup outer diameter: 27.23mm Outside rim contour: Medium Cup inner diameter: 16.94mm Inside rim contour: Medium+5 Cup depth: 1-1/2 between C and D Size comparison: Flat Rim ＜PRANA Series＞ This mouthpiece is designed with a wide backbore, excelling in breath support and intonation, especially in the high register. There are no major scratches, dents, or plating wear that would hinder performance, but there are shank marks and minor scratches. The box is not included. Please be aware of this. For reference, the cup feels between a Bach 1-1/2C and 3C, and the rim is flat and thick. I usually use a 1-1/2C, and I had the impression that Monette mouthpieces were quite particular, but I didn't feel that much of a difference with this one. I think this model is also recommended for those who haven't found Monette mouthpieces to be a good fit.