Diameter: 26.84 mm
Cup Diameter: 16.75 mm
Rim Width: 5.00 mm
Bore Size: 3.74 mm
Back Bore: Barrel
Heavytop models use a completely different principle in not feeding back to the player the vibration of the instruments, transmitting all the energy through the bell. This gives a much more powerful sound when needed, more security in the high register and more control and focus in all registers.