Greg Black 1-3/8G Regular Bass Trombone Mouthpiece Silver Plated SP Regular Cup Inner Diameter: 27.90mm Cup Depth: Deep Throat: Standard ★This is a used item, only test-played once after purchase. Although there is a slight feeling of use, it is a beautiful item that looks almost new. Regular weight specification with an easy-to-handle size. It has the powerful sound unique to Greg Black and a good balance of brightness and easy control.