This model should be suit to players who prefer a large rim and darker sound. Symphonic backbore is adoped. Rotary trumpet should match as well. -the manufacturer
Specs:
• Cup Diameter: 17.15mm
• Cup: mildly deep
• Throat: #24 (3.86mm)
• Backbore: L
• Rim Width: 5.823mm
• Rim Contour: flat
• Rim Top Balance: 43%
• Rim Bite: fairly sharp
• Similar to: Bach 1B (slightly smaller)