Yamaha Trombone 48d Mouthpiece S/shank

Yamaha Model 48D. Same rim as the 48 with a relatively deep cup. Rich lower register with a dark, soft tone. Similar to a Bach 6-1/2AL rim, but with a deeper cup. Inner Diameter = 25.25mm. Contour = standard. Thickness = standard. Cut Depth = semi-deep. Throat = 6.62mm. Backbone = semi-wide.