Yamaha Bass Trombone Mouthpiece BL-61D4L, brand new. This mouthpiece came with a Yamaha YBL835 bass trombone, but I am selling it as I don't plan to use it. Purchased in December 2025. ■ Features YAMAHA bass trombone mouthpiece. Standard series made of brass with silver plating. It has the largest inner rim diameter in the lineup, offering good response and excellent tone even at high volumes. ■ Specifications ・Inner Rim Diameter: 28.72mm ・Throat Diameter: 8.00mm ・Rim Contour: Slightly flat ・Rim Thickness: Slightly thin ・Cup Depth: Slightly deep bach CONN Shires Getzen schilke tilz