Dear Sir/Ms, We offer high quality masks - each designed to address your requirements. We help our customers thrive in a changing world with a cost-effective solution. Our 3 Layers of Masks: Fluid resistant outer layer Japan Mitsui Meltblown adopted Soft and nonabrasive inner layer Flexible aluminum nose piece Special made stretch yarn ear-loops 100% latex-free Face Mask Standards: Standards: Exceeds EN14683 and ASTM F2100 BFE: > 99% at 3 microns PFE: > 99% at 0.1 micron VFE: > 99% at 0.1 - 5 microns DELTA P: < 5.0 mm H2O/cm2 Fluid resistant: 160 mmHg Flame Spread: Class 1 Size: 17.5 * 9.5 cm Qty. Box/Pack: 50 pieces