40dB High Noise Reduction---With 3-layer structure,top Silicone material,the NRR can be up to 40dB, twice higher than ordinary earplugs. It's a great choice for studying, sleeping, working, Concerts and general hearing protection in noisy environments.can reduce the noise up to 40dB,10dB more than other similar earplug. Less noise, more happiness. Water and Reusable---The high-quality silicone earplugs is waterproof. It's fit for swimming, reducing the possibility of swimmer's ear infection. And if the earplug is dirty, just wash it in water and then dry it. It can be used again Environmentally Friendly Material---Comfortable Noise Cancelling earplugs are made of non-, soft silicone material which is environmentally friendly, parent and comfortable to wear for a long time. Kindly please put it to the correct ear, then it can reduce noise effectively Wide Application--- It's suitable for sleeping, snoring, studying, bathing, travel, loud events, concerts, flying discomfort, motorcycles, and more. Preserve High Fidelity Audio---This ear plugs do an effective job of bringing down the overall volume, blocking background noises at a comfortable level and meanwhile preserve the sound clarity and sharpness. You 't experience any muffling. You be to hear different sound frequencies without having to worry of muffling. Applicable scenes: running sports, sports , cycling sports, sports, swimming and wading sports, sleeping lunch breaks, various scenes Material: Silica gel colour: black Package Contents: 1 pair x earplugs (small ) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.