Conical structure design
Unlike the previous two versions, the
Narrow Bore version features a completely new internal structure with a conical design. After repeated testing and modifications, this structure complements the Narrow Bore's characteristics, and adjustments to the hardness and length of the tube ensure the precise path of sound waves at the speed of sound. Besides the internal structure, the Narrow Bore version also has a different appearance from the previous two versions, designed with a double flange-like shape for deep insertion.