*50-Pieces* 3M VFlex Particulate Respirator NIOSH N95 Surgical Face Mask 1804 Features:3M VFlex Particulate Respirator Face Mask.95% Filtration Efficiency.NIOSH N95 Approved. Package Includes:You Get 1 Box With 50 Masks. 3M Model#:1804 Returns are accepted within 30 days of delivery. All returned items must be exactly in original condition.