ENVIRONMENT FRIENDLY:it is made soft smoothy non-toxic silicone materials. it is totally safe to use.it is washable and reuseable.It bring relaxable quiet natural environment in heavy noisy places. PERFECT FOR:Noise reduction for work, home,sleeping and safety. Washable and reusable design.Compact design for easy storage and carry. BUILD QUALITY:Made of soft and snug silicone for noise reduction and providing you better hearing protection.string is made of nylon, which is strong and not easy to break down Reduce the noise can be reduced NRR: 24dB; SNR: 25dB USAGE:Are U feel lot of disturbance during study,sleep and meditation.As we know that we cannot stop outside noise like religious place loudspeaker,vehicles's honk and other person's awful noise. We feel headache problem,sleepness due to noise and unable to do our important task. If we cannot sleep properly in night,we cannot do day work task efficiently. Can be washed and reused many times,To protect your hearing well when you enjoy hunting and shooting