UNIAIR SH3500 is CDC NIOSH Approved N95 masks for at least 95 percent filtration efficiency against certain non-oil-based particles. Applied for Construction, Mining, Textile Industry, Grinding, Ironing, Welding, Cutting, Forging and Wood Processing, etc. Individually Wrapped. CDC NIOSH Approval number is TC-84A-4313. Manufactured by San Huei United Company Ltd.