NIOSH Approved : (NIOSH Approval Number: TC-84A-9421) - NIOSH Approved N95 respirator mask certified for at least 95% filtration efficiency against particulate aerosols free of oil. | Credible Manufacturer : Manufactured by Shanghai Yunqing Industrial Co., Ltd., a NIOSH approved manufacturer of N95 respirator mask. The mask is listed on the NIOSH website as an approved N95 mask. | Standard Head Loops : This is a NIOSH approved N95 mask that straps must go behind head instead of the ears to offer better protection. The straps are firmly attached and made of very comfortable cotton materials, more comfortable to wear for long periods of time. | 5-Layers of Protective Filtration : This black N95 mask is composed of 5 layers with 2 non-woven outer layers as well as a ultra-high grade melt-blown to filter micron particles and 2 layers hot-air cotton inner layers to absorb moisture. | Individually Packed : Unlike similar disposable N95 masks on the market, these N95 face masks come in packs of 50 pieces in a box and are individually packed for extra safety measures. With foldable design, you can take it around without taking up too much space. Ideal for keeping in your car, purse, office or home!