Check the listing for details. 50 Disposable Protective ASTM Level 3 Medical 3Ply Face Mask Yellow 50ct Box. Condition: New. Listed at 7.95 USD. Description This Level-3 Medical Grade Procedure Face Mask from LHM is one of the highest quality and efficient masks to be made. These face masks meet the ASTM F2100 Standard and carry a 510(K) certificate for use in a surgical or procedural setting. Made from three layers of non-woven fabric and comfortable elastic ear loops which eliminate pressure on the ears. The inner layer of the mask is a soft facial tissue that is soft on the skin and able to absorb moisture. The middle layer is made from a melt-blown polypropylene fabric treated with electret that filters out more than 95%-98% of particles and bacteria up to 0.1-0.3 micron. The outer layer is a waterproof non-woven fabric that is resistant to liquid penetration. Features 3-Layers Non-Woven FabricMedical Grade 510(K) FDA Certified95%-98% Bacterial FiltrationComfortable Ear-Loop DesignYellow 50ct Box Certification Lookup510(k) Number: K202240