MOQ:5000PCS NRR:30dB repeatedly used comfortable silica material hot sale 1. Good noise reduction effect, could be cleaned are repeatedly used2. With portable-type carton3. Noise insulation efficiency: 30dB4. Provide four packing modes of white box, color box, bag and sliding cardInner packing: White box, color box, bag and sliding Flexible and multi-color to chooseOuter packing: Due to inner ...