MASKS, FACE 3PLY EARLOOP, 900/BULK CASE, ASTM Level 2 MASKS, BLUE 900/BULK CASE HAS PLASTIC NOSE PIECE *MADE IN USA* Medical Grade Three layer construction ensures that the outer layer of our mask is protective while the inner layer is still smooth and comfortable. These masks have high filtration- their PFE rating exceeds 99% and their BFE rating exceeds 99%. 17.5cm by 9.5cm. NANOFORM GRAPHENE FREE MASK MFG: STRONGS