สถานที่กำเนิด
Guangdong, China
material
medical grade silicone rubber
feature
Breathable nature and strong,soft, comfortable,washed
Mean attenuation data
23.8 27.2 31.9 34.8 39.0 45. 41.1
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 8000
Function
noise reduction,hearing protection
Use
noisy working/sleeping/racing/shooting