NRR (Noise Reduction Rate) 26decibels Material: silica gel Packing: pp bag, paper case,plastic bottle,plastic box. NRR (Noise Reduction Rate) 26decibelsMaterial: silica gelPacking: pp bag, paper case,plastic bottle,plastic box. Various colors availableComfortable,effiective,lightweight,non-irritating. HK-1118A-105 box