Cup: 0G- Cup diameter: 29.5 mm- Bore: 7.92mm- Cup depth: deep- Rim width: medium thin- Silver-plated- This particular model combination and shape sits between the light and regular weights and gives those looking for a mouthpiece with different resistance and response a new option not previously offered- From auditions to symphony halls, this mouthpiece has been tried and tested and is perfect for bass trombone players who prefer larger diameters