This is a BUZZ original mouthpiece, produced by BUZZ, the general importer of brands like Kadison, and producer of various accessories and parts. Kadison is a top-quality manufacturer with advice from Luis Valle. The inner rim diameter is about the middle of Bach 7 to 10-1/2C. The rim is flat and quite thick. The outer edge of the rim is somewhat distinct. The inner edge of the rim is somewhat gentle. The cup is a gentle UV cup, about the same depth as a Bach E, and shallow. The throat is #28 (3.56mm). The backbore is about Warburton 8. The shank end thickness is about 0.8mm. Depending on the backbore used, the response is good, and the sound is bright and vibrant. It has a core and a rich, orthodox trumpet sound. It's designed for easy high notes, but the mid and low range is also warm and rich, making it a well-balanced mouthpiece. It has a very good balance of playability and sound. The thick rim design makes it less tiring, so it is recommended for big band and horn section players who play for long hours.