5-100 BLACK PROMASK KN95 Features:Free Same-Day Shipping (US Territories, HI, PR & GU only)*4-layers filters out over 95% PFE & BFE.Super-flexible Nose Bridge (metal strip) woven between layers (not on the outside).Ear-loops are flat, not round.Masks are packaged in plastic & box as shown in images.Implementation Standard: GB 2626-2006. We sell to Government Agencies & Healthcare Institutions. *Orders ship same day if placed before 1 PM PST For quick delivery to PR, HI & GU we highly recommend the optional expedited shipping options at checkout.