Place of Origin
Guangdong, China
Material
medical grade silicone rubber
Feature
Breathable nature and strong,so
Use
noisy working\sleeping\travelling
Mean attenuation data
23.8 27.2 31.9 34.8 39.0 45. 41.1
Function
noise reduction,hearing protectio
Standard deviation
3.9 4.1 5.8 4.5 3.3 4.7 5.3
Test frequencies in Hz
125 250 500 000 2000 4000 800
Color
various,up to client