... to 34dB,ergonomic design and flange multi stem comforms ear Our earplugs are made of PU & Silicon with ... design and multi-flanged stem comforms to ear shape and ear piece retention.Attenuation filter in 23db for music ... Soft PU material, rebound slowly and low pressure to ear canal;Packaging, polybag, plastic box, blister cases.PU ... blue PU or Silicon Bullet Low profile Industrial Ear Plugs GJ-01