Trumpet mouthpiece - silver 925 Series has been created especially for professionals who require superior quality from their mouthpiece. The Silver 925 Series are the first production mouthpieces in the world to be manufactured from pure sterling silver for a rich, warm tone core with sufficient sparkle for clarity and life. Relatively large rim diameter and shallow cup. Outstanding overall balance for all musical genres. It has 16.85 mm rim inner diameter and 3.65 mm throat.