1.Comlpliance :CE EN 352-2 2.OEM available Material: natural silica gelPrevent noise: 29 dBOptional connections: polyester thread/plastic line1,unique four flange design . 2,soft pliable material .3,provides comfortable and effective protection . 4,any color. 5,comlpliance :CE EN 352-2 LPT0115Pcs/Inner1pc Pcs/Ctn4000pcs Size/Ctn66*34.5*46cm G.W./N.W.12/11kg Earplug(SNR 27)