| 摘要 |
Disclosed is an earplug that includes a sound attenuating portion and a feature formed by laser ablation, wherein the feature comprises a cavity formed in a first end of the sound attenuating portion including a cylindrical shape extending into the sound attenuating portion, along a longitudinal axis of the sound attenuating portion, toward a second end of the sound attenuating portion opposite the first end, the earplug further comprising at least one of a cord, a stem, and a detectable insert disposed in the cavity. |
