... comfortable all-day fitEarplugs with retention device, ergonomic design and multi-flanged stem comforms to ear shape and ear piece retention.Attenuation filter ... ;Soft PU material, rebound slowly and low pressure to ear canal;Packaging, polybag, plastic box, blister cases.PU foam earplugs : Iterm NO.GJ ... Red, yellow, blue PU or Silicon Bullet Low profile Industrial Ear Plugs GJ-01