Harley N95 Respirator Face Mask - Model L-288 - NIOSH Approved - 20 per box. The Harley L-288 N95 Particulate Respirator Mask is a semi-rigid molded respirator sold in boxes of 20 masks. The mask is NIOSH-approved so functionalities such as penetration, breathing resistance, and strap strength meet or exceed the standards set by NIOSH to filter out at least 95% of airborne particles at a particle size of 0.3 microns. This respirator comes with an internal padded nose-piece for increased comfort and an aluminum clasp on the outside to help with the wearer's fit. Brand: Harley Commodity Model: L-288 NIOSH Approved FDA/CDC Registered 20 Masks per Box 20 Boxes per Case 400 Masks per Case