These soft earplugs utilize low-rebound urethane material for a comfortable fit. The moderate resilience provides the best fit. Hygienic individual packaging allows for use in a clean state every time. Environmentally friendly, they do not use any PVC, which generates harmful substances. You can use them with peace of mind. NRR (Noise Reduction Rating: Noise attenuation rating) = 33dB. Boasting top-class soundproofing performance among all earplugs. The product is individually packaged in pairs (2 pieces). Contains a total of 10 pairs (20 pieces)