Denis Wick Trombone Mouthpiece Classic 5ABL GP Large Shank 【5ABL】 Inner Rim Diameter: 25.73mm Rim Width: 6.64mm Bore Size: 7.15mm The 5ABL offers an even more lustrous, brilliant, and richer tone than the 5AL, achieved through cup modifications. Equivalent to a Bach 5GS. This is a traditional shape for Denis Wick mouthpieces. The "Classic Series" features a flat rim and a unique V-cup shape, allowing for a rounded and deep tone. It is popular among British-style brass band trombone players and euphonium players. The gold plating provides a smooth feel on the mouth and facilitates easy airflow. It is recommended for those who prefer a more cohesive tone. Perhaps due to past issues, the current Denis Wick gold plating is of very high quality.