This is the STORK CUSTOM STUDIO MASTER XV10. It's a mouthpiece said to be designed for studio players, offering easy and precise control. The rim size is quite similar to a Bach 10-1/2. The cup is shallow, around a D to E, but the throat and entrance have a slight double-cup shape. It produces a very brilliant sound that records well. It can also produce a prominent sound for lead playing in a big band. A characteristic of this mouthpiece is that it's about 7mm shorter in overall length compared to a standard mouthpiece. The shank is a Bach shank (or so it seems). There are some minor scratches on the rim and the shank end, but they don't affect playability. It falls into the semi-vintage category, so please be aware of age-related deterioration. Depending on the time of day, same-day shipping is possible.