Disposable Respirator, Mask Size Small, (wears like a medium) NIOSH Rating N95, ASTM Splash Rating Level 3, ISO Cleanroom Class Not Rated, Mask Head strap Type Dual, Non-Adjustable, Mask Shape Molded, Mask Material Dura-Mesh(R), Exhalation Valve No, Package Quantity 20 Please compare pricing, you won't find it anywhere cheaper! Fast shipping! (Please note, if you buy multiple cases, I may issue a partial refund on the shipping. Due to the case size and variable shipping locations, I try to be fair with shipping charges) Last, I reserve the right to ship the most efficient shipping service economically allow. Thanks for looking!