Blue Surgical Tie-on Mask, Level 2 (6x 50bx)Surgical Tie on Ideal for procedures where moderate to light amounts of fluid, spray and or aerosols are produced. ASTM LEVEL 2 Fluid Resistance =120 mmHg BFE >98% at 3 microns PFE > 98% at 0. 1 micron Delta P, mm H2O cm2 <5. 0 Meets EN14683 Rating Type IIR Standard Fluid resistant outer layer Fluid resistant white inner layer Extra large panel for surgical procedures Extra long aluminum nose piece