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