*Material:PU Foam
*Connecting:with or without Connected by Rope for Each Pair
*Noise Reduction Coefficient:NRR 28dB
*Certification:CE EN352-2
*Packing:1 Pair / Polybag or Plastic Box
by Polybag:500 pairs / Carton,5 / 4kg,50 x 36 x 23cm
by Plastic Box:500 pairs / Carton,13 / 11kg,52 x 31 x 45cm