1) Made of 100 % silicone 2) Easy to clean and reusable 3) Allow ear ... be in position for long period 1) Made of 100 % silicone, 2) Easy to clean and reusable, 3) Allow ear ... Military, Trains, Motorbikes, Discotheques, Shooting ranges etc. 5) Useful in all noisy environments and as a pressure equalizer, especially on take ... is expelled. Store in the special container storage provided. Silicone Ear Plug