... device, ergonomic design and multi-flanged stem comforms to ear shape and ear piece retention.Attenuation filter in 23db for music events ... number;Soft PU material, rebound slowly and low pressure to ear canal;Packaging, polybag, plastic box, blister cases.PU foam ... time5-25 secondsCertificateCE EN352-2CordNylon, PVC Bullet shape protective Industrial Ear Plugs and disco, music Ear Plug GJ-02