Trumpet Mouthpiece Selling to organize my mouthpieces. Used only a few times for testing. There are no noticeable scratches, but please check the photos carefully before purchasing. Additional product description ↓ This is a very rare mouthpiece, a popular model GROOVE 3C by Best Brass, with custom-ordered "GROOVE processing." Based on the excellent resonance of the standard GROOVE 3C, it has been further evolved into professional specifications. Benefits of custom processing Improved response: The sound starts very quickly, and the attack becomes clear. Rich overtones: Adds depth and core to the sound, realizing a richer tone. Excellent controllability: Accurately responds to subtle changes in volume.