... ergonomic design and multi-flanged stem comforms to ear shape and ear piece retention.Attenuation filter in 23db for music ... number;Soft PU material, rebound slowly and low pressure to ear canal;Packaging, polybag, plastic box, blister cases.PU ... , green, red, etcRebound time5-25 secondsCertificateCE EN352-2CordNylon, PVC Red, yellow, blue PU or Silicon Bullet Low profile Industrial Ear Plugs GJ ...