Implementation standard: GB2626-2006 Main ingredients: environmental non-woven fabric, antibacterial meltblown filter material Structure: 4-layer material, double-layer antibacterial meltblown cloth (N95 material) Shelf life: 2 years Grade: Qualified Origin: Guangdong, China Features: 1. KN95 standard,96% filtering efficiency. 2. Double-layer antibacterial meltblown cloth+environmental non-woven fabric 3. Metal nose clip + sponge cushion, perfect fit 4, Elastic ear straps, comfortable to wear