Diameter: 27.45 mm
Cup Diameter: 17.25 mm
Rim Width: 5.10 mm
Bore Size: 4.40 mm
Back Bore: V-type

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.