... 3.custom made,option:cord 4.low carbon,environmental protectio *slow rebound SNR33db more than 30 seconds*safety and soft*washable ... up ears (this is important) and hold, then rub the small earplug round towards ears, stuffed them; 3. Hand on earplug ... swelling,earache and other discomfort. Flexibility can not be too small to close contact with the external earcanal, noise effect will ...