GR Trumpet Mouthpiece 65SZ The following is quoted from Net Brass: --- GR mouthpieces are designed and manufactured using modern technology such as acoustics. The GR logo and "Compu-Balanced 65S-Z USA" are laser engraved on the body. You can check the specifications of GR here. This design is supported by players who use Bob Reeves ES cup, Silky A cup, etc. The inner diameter is slightly smaller than a Bach 3C. The rim is flat and slightly thick. It has a gentle cushion rim shape towards the outer edge of the rim. Therefore, the outer diameter of the rim feels only slightly smaller than a Bach 3C. The inner edge of the rim is somewhat distinct. The inner edge of the rim is scooped out, making it difficult for the lips to touch the inner wall of the cup, and the design is less tiring. The cup is shallow, about the same as a Bach F. The edge of the shoulder connecting the cup to the throat is distinct. The throat is #27 (3.66mm). The backbore is about the same as a Warburton 5. It has very good response and a brilliant, fast-paced sound. You can feel the good pitch and the even balance throughout the entire range. It is a very efficient design that does not allow the vibration of the lips in the cup to escape, making it easy to control high notes. Recommended for big band lead players, ska, horn sections, etc. It sounds good and produces a good volume even when played lightly, expanding the range of dynamics and expressiveness. --- There are scratches from use, but there are no major scratches, dents, or plating剥がれ that would interfere with playing. (Please check the photos carefully) I am not considering lowering the price at this time. This is a used item, so please refrain from purchasing if you are nervous or concerned.