Now for the specs. This GP model has a 28.58mm cup diameter and a wide overall rim diameter. That's a bit wider than a traditional Bach-like blank (1.555"). It's not uber-wide, but it does allow for more contact than most bass mouthpieces. You'll recognize the blank design as being the same as those from the Alessi line.
• Cup diameter: 28.58mm (1.125 inch)
• Throat: 7.77mm (0.306")
• Rim: Wide 5.965mm (0.235 inch)
• Blank: Standard weight
• Silver plated