This is the top of an AR Resonance trumpet mouthpiece. Inner Diameter: ML (equivalent to Bach 1-1/2) Depth: B (Deep) Material: Brass The deep cup is suitable for a dark sound. Even though it's deep, the pitch doesn't waver at all. There are no scratches or dents. It's only been test-played, so the rim is still clean. New retail price in Japan: ¥23,320