FW3 comes standard with 2 types of vocal earmuffs for different tunings to meet different sound needs.
The HS18 is softer, with a larger hole in the sound tube, less sound wave refraction, and less burr.
FW3 sound tube diameter: 6.4mm. If you need to buy other brands of eartips, you can provide this size and confirm with the seller whether it can fit.
