Noise Reducing: 28dB Noise Reduction Rating (NRR) hearing protection. Block harmful noises effectively. Protect hearing in loud events or set up quiet environment for sleep effectively High Fidelity: Silicone earplugs keeps sound quality of the music on concerts and festivals. Audio fidelity damping of loud music to keep the full spectrum of the sound. No dull blocking like foam material plugs Widely application: Get effective noise reduction with in-ear ear plugs that are small, clear, yet powerful enough to protect your hearing in noisy conditions. Can be used as anti-noise sleeping plugs, travel earplugs, swimming plugs, soft noise reduction earplugs at work or entertainment etc Natural Soft Silicon MaterialEar Plugs with string made of highest quality hypoallergenic, non-toxic, soft silicone, will not hurt ear canal. Does not cause itching or allergic reactions as other plastic or PVC materials do Four different colors:You can choose one to wear according to your hair color and clothing. Four free carrying case included to help keep plugs clean and portable in your purse, backpack or pocket.each pair of earplugs has a separate box