Protective ear loop masks agains Corona virus 4PLY CARBON MASK.>> 300cs x 40boxes x50=600,000 masks Technical Specs Dimension: 7" x 3.75" Style: Elastic Earloop Construction 4 layer 20gsm PP Woven 40gsm non woven with activated carbon 20gsm filter fabric 25gsm PP non-woven BFE: 95% to 99%