... up to 34dB,ergonomic design and flange multi stem comforms ear Our earplugs are made of PU & Silicon with noise reduction ... 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 earplugs ...